Here are 100 books that Delusions of Intelligence fans have personally recommended if you like Delusions of Intelligence. Shepherd is a community of 12,000+ authors and super readers sharing their favorite books with the world.

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Book cover of The Hut Six Story: Breaking the Enigma Codes

Mark Baldwin

From my list on the Enigma Machine and Bletchley Park.

Why am I passionate about this?

Dr. Mark Baldwin – aka Dr. Enigma – is a world expert and speaker on the Enigma machine and has delivered over 700 presentations and demonstrations (using his own, genuine wartime Enigma machine) to some 70,000 people around the world. He has spoken to a wide range of audiences, from cybersecurity experts and software developers at leading Silicon Valley tech companies such as Facebook, Dropbox, and PayPal, to academic audiences at universities, executives at business conferences, and the general public in a couple of hundred one-man theatre shows.

Mark's book list on the Enigma Machine and Bletchley Park

Mark Baldwin Why Mark loves this book

The Enigma story and Bletchley Park are now legitimate subjects for academic study, but modern books are necessarily written by people without first-hand experience of wartime Intelligence work. As a publisher, I have always been keen to record the experiences of those people personally involved in such things, and Welchman was not just a leading codebreaker at Bletchley Park throughout the whole war, he was also instrumental in transforming a random collection of a hundred academics into a non-stop production line of codebreaking and Intelligence, employing over ten thousand people. This, our best-selling book, continues to intrigue readers worldwide.

By Gordon Welchman ,

Why should I read it?

1 author picked The Hut Six Story as one of their favorite books, and they share why you should read it.

What is this book about?

Book by Welchman, Gordon


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Book cover of Aggressor

Aggressor by FX Holden,

It is April 1st, 2038. Day 60 of China's blockade of the rebel island of Taiwan.

The US government has agreed to provide Taiwan with a weapons system so advanced that it can disrupt the balance of power in the region. But what pilot would be crazy enough to run…

Book cover of The Bletchley Park Codebreakers

Mark Baldwin

From my list on the Enigma Machine and Bletchley Park.

Why am I passionate about this?

Dr. Mark Baldwin – aka Dr. Enigma – is a world expert and speaker on the Enigma machine and has delivered over 700 presentations and demonstrations (using his own, genuine wartime Enigma machine) to some 70,000 people around the world. He has spoken to a wide range of audiences, from cybersecurity experts and software developers at leading Silicon Valley tech companies such as Facebook, Dropbox, and PayPal, to academic audiences at universities, executives at business conferences, and the general public in a couple of hundred one-man theatre shows.

Mark's book list on the Enigma Machine and Bletchley Park

Mark Baldwin Why Mark loves this book

This anthology is a valuable complement to my first book, with a couple of dozen contributors: a mixture of some who worked at Bletchley Park during the war, and some who are professional historians. The passage of time has encouraged archival research, and allowed historical analysis, producing an authoritative account of Bletchley’s achievements, particularly the breaking of millions of Enigma-enciphered messages.

By Michael Smith , Ralph Erskine ,

Why should I read it?

1 author picked The Bletchley Park Codebreakers as one of their favorite books, and they share why you should read it.

What is this book about?

The British codebreakers at Bletchley Park are now believed to have shortened the duration of the Second World War by up to two years. During the dark days of 1941, as Britain stood almost alone against the the Nazis, this remarkable achievement seemed impossible. This extraordinary book, originally published as Action This Day, includes descriptions by some of Britain's foremost historians of the work of Bletchley Park, from the breaking ofEnigma and other wartime codes to the invention of modern computing, and its influence on Cold War codebreaking. Crucially, it features personal reminiscences and very human stories of wartime codebreaking…


Book cover of Alan Turing: The Enigma

C.A. Farlow Author Of A Quantum Singularity: Book Three in The Nexus Series

From my list on mixing science, fiction, and adventure.

Why am I passionate about this?

I grew up in farm country of central Indiana. But spent my summers on an island in northern Ontario with my grandparents. My grandfather was a self-taught naturalist and shared his love and fascination of the world around us with me. I went on to become a geologist and traveled the globe exploring for natural resources. My love of nature and science is the foundation for the science fiction I write. Whether a proven theory, a fantastical hypothesis, or true science fiction, it’s all based on science fact. It allows everyone to learn about a world built in science fiction which one day may exist in science fact.

C.A.'s book list on mixing science, fiction, and adventure

C.A. Farlow Why C.A. loves this book

This is a book that is at once a biography, a testament to human genius in the face of imminent danger, and a story of human injustice. Alan Turing had an idea about a ‘universal machine’. A machine, when built at Bletchley Park, allowed the Allies in World War II to crack the German Enigma ciphers. This universal machine laid the foundations for modern computing and all the amazing advances we enjoy today. But at a price for Turing, he fought inner demons about his homosexuality and eventually paid the ultimate price.

I marveled at his genius, cheered his cryptographic successes with each cipher cracked, shouted against the tragedy of his arrest, cried at his untimely death. A death at his own hand at the age of 41. The world lost a genius due to a society’s labelling of homosexuality as a crime.

We still live in this world of…

By Andrew Hodges ,

Why should I read it?

6 authors picked Alan Turing as one of their favorite books, and they share why you should read it.

What is this book about?

A NEW YORK TIMES BESTSELLER The official book behind the Academy Award-winning film The Imitation Game, starring Benedict Cumberbatch and Keira Knightley It is only a slight exaggeration to say that the British mathematician Alan Turing (1912-1954) saved the Allies from the Nazis, invented the computer and artificial intelligence, and anticipated gay liberation by decades--all before his suicide at age forty-one. This New York Times-bestselling biography of the founder of computer science, with a new preface by the author that addresses Turing's royal pardon in 2013, is the definitive account of an extraordinary mind and life. Capturing both the inner…


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Book cover of Trusting Her Duke

Trusting Her Duke by Arietta Richmond,

A Duke with rigid opinions, a Lady whose beliefs conflict with his, a long disputed parcel of land, a conniving neighbour, a desperate collaboration, a failure of trust, a love found despite it all.

Alexander Cavendish, Duke of Ravensworth, returned from war to find that his father and brother had…

Book cover of X Y & Z: The Real Story of How Enigma Was Broken

Mark Baldwin

From my list on the Enigma Machine and Bletchley Park.

Why am I passionate about this?

Dr. Mark Baldwin – aka Dr. Enigma – is a world expert and speaker on the Enigma machine and has delivered over 700 presentations and demonstrations (using his own, genuine wartime Enigma machine) to some 70,000 people around the world. He has spoken to a wide range of audiences, from cybersecurity experts and software developers at leading Silicon Valley tech companies such as Facebook, Dropbox, and PayPal, to academic audiences at universities, executives at business conferences, and the general public in a couple of hundred one-man theatre shows.

Mark's book list on the Enigma Machine and Bletchley Park

Mark Baldwin Why Mark loves this book

The brilliance of the Bletchley Park codebreakers is undoubted, but it must be remembered that they did not start from scratch; they built on the work of the cryptanalysts of the Polish Cipher Bureau, who had first broken Enigma ciphers in 1932, and then passed on all their knowledge to Britain in 1939, before the war began. The tentative and suspicious negotiations between Poland, France and the UK were convoluted and lengthy. Alan Turing’s nephew conducted ground-breaking research in archives in the UK, France, Germany, Poland and the USA to compile this unrivalled account of those early days.

By Dermot Turing ,

Why should I read it?

1 author picked X Y & Z as one of their favorite books, and they share why you should read it.

What is this book about?

December, 1932
In the bathroom of a Belgian hotel, a French spymaster photographs top-secret documents - the operating instructions of the cipher machine, Enigma. A few weeks later a mathematician in Warsaw begins to decipher the coded communications of the Third Reich and lays the foundations for the code-breaking operation at Bletchley Park. The co-operation between France, Britain and Poland is given the cover-name 'X, Y & Z'.
December, 1942
It is the middle of World War Two. The Polish code-breakers have risked their lives to continue their work inside Vichy France, even as an uncertain future faces their homeland.…


Book cover of The Enigma Girls: How Ten Teenagers Broke Ciphers, Kept Secrets, and Helped Win World War II

Marlene Targ Brill Author Of Jane Addams: The Most Dangerous Woman in America

From my list on groundbreaking women in history.

Why am I passionate about this?

As the author of 73 published books, I have four goals for writing. I want to write more women into history, emphasize how everyday activities children accomplish are important, empower young readers, and tell a story that moves readers, either through an emotional response or the knowledge that they can do what whoever I wrote about did. My biographies cover role models who have been groundbreakers in their time and place. Readers can be, too.

Marlene's book list on groundbreaking women in history

Marlene Targ Brill Why Marlene loves this book

 Today, I’m told to ask a teen—or younger—for help with technology. As war threatened all of Europe in 1941, Great Britain turned to a group of teenage women to break secret Nazi codes. The Brits hid away the teens during an operation at Bletchley Park that was so secret that participants, to this day, can't t talk about what they accomplished.

With Fleming’s strong writing and excellent research, the story of these other groundbreaking women comes alive.

By Candace Fleming ,

Why should I read it?

1 author picked The Enigma Girls as one of their favorite books, and they share why you should read it. This book is for kids age 8, 9, 10, and 11.

What is this book about?

From award-winning author Candace
Fleming, comes the powerful and fascinating story of the brave
and dedicated young women who helped turn the tides of World
War II for the Allies, with their hard work and determination at
Bletchley Park.
"You are to report to Station X at Bletchley Park, Buckinghamshire,
in four days time ... That is all you need to know." This was
the terse telegram hundreds of young women throughout the British
Isles received in the spring of 1941, as World War II raged.
As they arrived at Station X, a sprawling mansion in a state of disrepair…


Book cover of Behind the Enigma: The Authorized History of Gchq, Britain's Secret Cyber-Intelligence Agency

Helen Fry Author Of Mi9: A History of the Secret Service for Escape and Evasion in World War Two

From my list on intelligence and espionage.

Why am I passionate about this?

Historian Dr. Helen Fry has written numerous books on the Second World War with particular reference to the 10,000 Germans who fought for Britain, and also British intelligence, espionage and WWII. She is the author of the bestselling book The Walls have Ears: The Greatest Intelligence Operation of WWII which was one of the Daily Mail’s top 8 Books of the Year for War. She has written over 25 books – including The London Cage about London’s secret WWII Interrogation Centre. Her latest book is MI9: The British Secret Service for Escape & Evasion in WWII – the first history of MI9 for 40 years. Helen has appeared in numerous TV documentaries, including David Jason’s Secret Service, Spying on Hitler’s Army, and Home Front Heroes on BBC1. Helen is an ambassador for the Museum of Military Intelligence, and President of the Friends of the National Archives. 


Helen's book list on intelligence and espionage

Helen Fry Why Helen loves this book

This is the long-anticipated authorized history of GCHQ, one of Britain’s most top-secret intelligence agencies that was published in 2020. John Ferris was granted rare access to the majority of the archives at GCHQ headquarters in Cheltenham.  This volume of over 800 pages provides an open assessment of the crucial role of GCHQ in the most important defining moments of the 20th and 21st centuries; from the codebreakers of the First World War, to breaking of the German Enigma codes in the Second World War, and to contemporary times with the betrayal by whistleblower Edward Snowdon in 2013. Ferris has not been tempted to glamourize GCHQ’s contribution and legacy but provides an honest account that acknowledges that much intelligence work can be laborious. But this does not deflect from the agency’s achievements and fascinating history.

By John Ferris ,

Why should I read it?

1 author picked Behind the Enigma as one of their favorite books, and they share why you should read it.

What is this book about?

You know about MI5. You know about MI6. Now discover the untold stories behind Britain's most secretive intelligence agency, in the first ever authorised history of GCHQ. For a hundred years, GCHQ - Government Communications Headquarters - has been at the forefront of innovation in national security and British secret statecraft. Famed for its codebreaking achievements during the Second World War, and essential to the Allied victory, GCHQ also held a critical role in both the Falklands War and Cold War. Today, amidst the growing threats of terrorism and online crime, GCHQ continues to be the UK's leading intelligence, security…


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Book cover of The Duke's Christmas Redemption

The Duke's Christmas Redemption by Arietta Richmond,

A Duke who has rejected love, a Lady who dreams of a love match, an arranged marriage, a house full of secrets, a most unneighborly neighbor, a plot to destroy reputations, an unexpected love that redeems it all.

Lady Charlotte Wyndham, given in an arranged marriage to a man she…

Book cover of The Theory That Would Not Die: How Bayes' Rule Cracked the Enigma Code, Hunted Down Russian Submarines, and Emerged Triumphant from Two Centuries of Controversy

Bastiaan C. van Fraassen Author Of Philosophy and Science of Risk: An Introduction

From my list on exploring the meaning of probability and risk.

Why am I passionate about this?

I’ve wanted to be a philosopher since I read Plato’s Phaedo when I was 17, a new immigrant in Canada. Since then, I’ve been fascinated with time, space, and quantum mechanics and involved in the great debates about their mysteries. I saw probability coming into play more and more in curious roles both in the sciences and in practical life. These five books led me on an exciting journey into the history of probability, the meaning of risk, and the use of probability to assess the possibility of harm. I was gripped, entertained, illuminated, and often amazed at what I was discovering. 

Bastiaan's book list on exploring the meaning of probability and risk

Bastiaan C. van Fraassen Why Bastiaan loves this book

Can you love a book that you disagree with? I do! I love this extravagant account of how Bayesian Statistics was enmired in controversy and, after 200 years, saved everything from Western Civilization to Captain Dreyfus.

I don’t think that Bayesian statistics is the foundation of all rational thought, but I am happy to celebrate all its wonderful achievements. Every page of this book is lively and personal, engrossing, entertaining, masterful…all of that.

By Sharon Bertsch McGrayne ,

Why should I read it?

2 authors picked The Theory That Would Not Die as one of their favorite books, and they share why you should read it.

What is this book about?

A New York Times Book Review Editor's Choice: A vivid account of the generations-long dispute over Bayes' rule, one of the greatest breakthroughs in the history of applied mathematics and statistics

"An intellectual romp touching on, among other topics, military ingenuity, the origins of modern epidemiology, and the theological foundation of modern mathematics."-Michael Washburn, Boston Globe

"To have crafted a page-turner out of the history of statistics is an impressive feat. If only lectures at university had been this racy."-David Robson, New Scientist

Bayes' rule appears to be a straightforward, one-line theorem: by updating our initial beliefs with objective new…


Book cover of I Worked Alone: Diary of a Double Agent in World War II Europe

Mary Kathryn Barbier Author Of Spies, Lies, and Citizenship: The Hunt for Nazi Criminals

From my list on WW2 intelligence history.

Why am I passionate about this?

I am a professor at Mississippi State University and a historian of World War II in general and, more specifically, of WWII intelligence history. My interest stems from a research topic that my Ph.D. advisor recommended and that became the subject of my dissertation – Operation Fortitude, which was the deception plan that provided cover for the Normandy Invasion. While my own research interests are focused on the intelligence history of the Normandy invasion, I am increasingly drawn to intelligence history or novels that showcase the people, technologies, and other theaters of war.

Mary's book list on WW2 intelligence history

Mary Kathryn Barbier Why Mary loves this book

As the title of this book indicates, Lily Sergueiew was a double agent during World War II. She volunteered to become a spy for the Germans although she never intended to fulfill that role. She was determined to fight the Germans in her own way – as a double agent in the employ of the British. Sergueiew kept a diary of her activities from when she first approached the Germans until she quit working for the British in late June 1944. After the war, Sergueiew used her diaries to write a memoir in French. Before her death in 1950, she translated her memoir into English, and most of it was published posthumously in France in 1966 and in England in 1968. I recommend this book because it provides insight into why a young woman would choose to fight against the Germans who occupied her beloved France, the training that she…

By Lily Sergueiew ,

Why should I read it?

1 author picked I Worked Alone as one of their favorite books, and they share why you should read it.

What is this book about?

During World War II Nathalie ""Lily"" Sergueiew, a woman of mystery, confidently seduced the German Intelligence Service into employing her as a spy against their British enemy. Little did they know that this striking woman - who turned heads when she walked into a room with her little dog Babs - would in reality work with their enemy against them. Her diary chronicles her years as a double agent for the British from 1940-1945 under the code name Treasure. From the moment she conceived the idea of becoming a double agent, Lily faced challenges on two fronts: first, she had…


Book cover of Agent Zigzag: A True Story of Nazi Espionage, Love, and Betrayal

David Andrew Westwood Author Of Kelsmeath, 1940

From my list on the weirder side of World War II.

Why am I passionate about this?

I grew up in London, and while I was born sometime after WWII, its devastation was still clear in my bombed suburb and in the stories from my family. My father and his brother served in the Royal Air Force, and an Austrian aunt had managed to escape the rest of her family's fate in Auschwitz. I've had five nonfiction books published when I decided to write a biography of my uncle David Lloyd, an RAF Spitfire pilot killed in 1942. Sadly, little information was available from his military records. All I had was a photograph of him in his plane, looking young and confident. I went on to write nine books set during WWII, and five during WWI.

David's book list on the weirder side of World War II

David Andrew Westwood Why David loves this book

Nowhere is the phrase "stranger than fiction" more appropriate than in describing Agent Zigzag. Charming British conman Eddie Chapman turned himself into one of the best double agents his country ever produced. But for whom was he really working? None of his handlers seemed to be sure. His squirming loyalties allowed him to keep a family and a mistress, to remain alive despite interrogation by both sides, and earn an Iron Cross from Germany's Abwehr and a pardon from MI5 for blowing up a British factory. I was astonished by this tale, and left wondering if Chapman, in the end, just worked for Chapman.

By Ben Macintyre ,

Why should I read it?

3 authors picked Agent Zigzag as one of their favorite books, and they share why you should read it.

What is this book about?

From the bestselling author of Operation Mincemeat, now a major film SHORTLISTED FOR THE COSTA BIOGRAPHY AWARD 'Engrossing as any thriller' Daily Telegraph 'Superb. Meticulously researched, splendidly told, immensely entertaining' John le Carre 'This is the most amazing book, full of fascinating and hair-raising true life adventures ... It would be impossible to recommend it too highly' Mail on Sunday _______ One December night in 1942, a Nazi parachutist landed in a Cambridgeshire field. His mission: to sabotage the British war effort. His name was Eddie Chapman, but he would shortly become MI5's Agent Zigzag. Dashing and suave, courageous and…


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Book cover of Old Man Country

Old Man Country by Thomas R. Cole,

This book follows the journey of a writer in search of wisdom as he narrates encounters with 12 distinguished American men over 80, including Paul Volcker, the former head of the Federal Reserve, and Denton Cooley, the world’s most famous heart surgeon.

In these and other intimate conversations, the book…

Book cover of Bomber Boys: Fighting Back 1940-1945

Helena P. Schrader Author Of Moral Fibre: A Bomber Pilot's Story

From my list on R.A.F. Bomber Crews.

Why am I passionate about this?

As a child, I heard tales of my uncle Ken, an RCAF Halifax navigator, who was shot down over Berlin in January 1944. As an adult, I lived in Berlin while earning a PhD in History and left roses on my uncle’s grave. Now, I am retired, and with the noise of earning a living silenced, I can hear the voices of those who want their story told. Among them are men from Bomber Command who feel they have been ignored and disparaged in fictional writing about WWII. I hope to correct that injustice and depict them as people rather than symbols or victims.

Helena's book list on R.A.F. Bomber Crews

Helena P. Schrader Why Helena loves this book

Bishop’s Bomber Boys is a good, solid history full of facts, stats, and the bird’s eye view.

Bishop provides cogent summaries of the policy and command decisions, analyzes the social structure of the RAF, aircrew, and Bomber Command, and tackles a range of important issues topically.

For example, he has a chapter on crewing up, on “the chop,” the “crack up,” and “love in uniform,” among others. It also offers aircraft diagrams and maps, which can be very useful.

It is an excellent starting point for learning about the subject, providing useful context and framework to a researcher, although it cannot serve as a substitute for reading first-hand accounts. 

By Patrick Bishop ,

Why should I read it?

1 author picked Bomber Boys as one of their favorite books, and they share why you should read it.

What is this book about?

Following on from his best-selling 'Fighter Boys', in this very different book, Patrick Bishop looks back at the lives, human realities and the extraordinary risks that the painfully young pilots took during the strategic air-offensive against Germany from 1940-1945.

In 'Fighter Boys' Patrick Bishop brought to life the pilots who flew Spitfires and Hurricanes in the summer of 1940. Their skill and bravery decided the Battle of Britain, which saved the nation from invasion and created the conditions for Hitler's defeat.

In 'Bomber Boys' he tells a different but equally fascinating story. The 125,000 men from all over the world…


Book cover of The Hut Six Story: Breaking the Enigma Codes
Book cover of The Bletchley Park Codebreakers
Book cover of Alan Turing: The Enigma

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