Picked by Sigma Force fans

Here are 16 books that Sigma Force fans have personally recommended once you finish the Sigma Force series. Shepherd is a community of authors and super-readers sharing their favorite books with the world.

Book cover of Thunderhead

Mark Terry Author Of Crystal Storm

From my list on science is trying to kill us all.

Why am I passionate about this?

Currently, the world seems concerned that artificial intelligence (AI) will destroy the world or at least put many of us out of jobs. Only a few years ago, a significant part of the population believed that COVID-19 was made in a Chinese laboratory and intentionally or accidentally leashed on the world, killing millions. This isn’t just a theme in tech thrillers; it’s a theme in life. Whether it’s nuclear weapons, genetic engineering, AI, or some other type of technology, there’s always a fear that it’ll do more damage than good and, at its worst, bring an end to the world. 

Mark's book list on science is trying to kill us all

Mark Terry Why Mark loves this book

I’ve long been fascinated by the mysteries of the Anasazi, or the Pueblo Dwellers of southwestern Utah. How and why did a thriving culture of literally thousands of people who had built stone buildings into cliff faces suddenly and inexplicably disappear? Having read numerous books by archaeologists on the subject, I was really no closer to an answer. But when Preston and Child wrote a novel, a combination of adventure, tech thriller, and mythology, I was completely on board.

Archaeologist Nora Kelly’s father disappeared without a trace 16 years earlier in the remote desert, searching for the legendary Quivira, a city of gold and wonder, the lost city of the Anasazi Indians. Pulling together a team, using some NASA satellite research to find a starting place, Nora leads a team into the desolate canyonlands in search of the city—only to find extraordinary mythology, life-threatening natural events, and a deadly, dangerous…

By Douglas Preston , Lincoln Child ,

Why should I read it?

2 authors picked Thunderhead as one of their favorite books, and they share why you should read it.

What is this book about?

On a visit to her family's abandoned Santa Fe ranch, archaeologist Nora Kelly discovers an old letter, written from her father to her mother, now both dead. What perplexes Nora is the fact that the faded envelope was mailed and postmarked only a few weeks earlier.
Her father had vanished into the remote canyon country of Utah 16 years before, searching for Quivira, the fabled Lost City of Gold, whose legend has captivated explorers since the days of Coronado. Upon reading the letter, Nora learns that her father believed he had, in fact, located the lost city. But what happened…


Book cover of Our Final Invention: Artificial Intelligence and the End of the Human Era

Nicholas Maes Author Of Laughing Wolf

From my list on to understand (and survive) modernity.

Why am I passionate about this?

I am a classicist (Greek and Latin) and a serious student of history. Modernity has obsessed me for the last 10 years, how it unfolds, what its implications are, whether it generates more gains than losses, whether it’s changing us profoundly and whether we can dodge it or not. Because of this interest (which I lecture on often) I am fascinated to see modernity’s gleanings in earlier times and always curious to see what other critics make of it. Because its effects will only grow down the road, the task of understanding its mechanisms and outcomes is one of extreme urgency, as these books illustrate in different ways.

Nicholas' book list on to understand (and survive) modernity

Nicholas Maes Why Nicholas loves this book

Just when I thought the future was bright and sunny (in part due to Kurzweil), I learn from James Barrat that ASI (Artificial Super Intelligence) might well mark the end of our species (and the start of an ever-expanding artificial replacement).

I was fascinated by the people Barrat introduces us to like an expert on the psychology of ASI, and his description of a perfect machine and its runaway implications. I realized this is modernity at its best and worst: we push forward to improve the world but are always at the risk of creating new, unseen problems.

The most troubling question of all (to my way of thinking) is that our idea of perfected humanity (both a modern and a pre-modern aim) ends in the vision of machines like Watson playing endless games of Jeopardy among themselves.

By James Barrat ,

Why should I read it?

3 authors picked Our Final Invention as one of their favorite books, and they share why you should read it.

What is this book about?

Elon Musk named Our Final Invention one of 5 books everyone should read about the future

A Huffington Post Definitive Tech Book of 2013

Artificial Intelligence helps choose what books you buy, what movies you see, and even who you date. It puts the "smart" in your smartphone and soon it will drive your car. It makes most of the trades on Wall Street, and controls vital energy, water, and transportation infrastructure. But Artificial Intelligence can also threaten our existence.

In as little as a decade, AI could match and then surpass human intelligence. Corporations and government agencies are pouring…


Book cover of SuperFuel: Thorium, the Green Energy Source for the Future

Henry Sipes Author Of NUERA1

From my list on questioning the future survival of humanity.

Why am I passionate about this?

I’ve spent decades showing people the beauty of space in my telescope, and volunteering for a college/park observatory, and NASA’s JPL Solar System Ambassador program here in Kentucky. My question – was it a waste of time? I should have been selling humanity on love and setting aside hatred. What is the point of dreaming of going to the stars if we are only going to take the same hatred with us. I write to cry my thoughts into words and attempt in some small part to bring hope that we can leave hatred behind, embrace diversity, and use the wonders of science to colonize our solar system and beyond.

Henry's book list on questioning the future survival of humanity

Henry Sipes Why Henry loves this book

My father and I were both speechless after reading this book. We were unable to put into words our rage at this nuclear energy cover-up. Instead of developing clean nuclear energy that could fuel the world, the world pursued nuclear energy that could destroy humanity. There is enough thorium to fuel the world and beyond for centuries. However, it cannot be used to make bombs. With the world in an energy crisis, we hoped writing letters to the Senator of Kentucky would give life to the idea of using thorium once again. Sadly, some only care about destroying cities. Everyone should read this book and learn about the alternative to uranium.

By Richard Martin ,

Why should I read it?

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

What is this book about?

At the dawn of the atomic age, uranium and thorium were equally important as the elements of choice in researching nuclear energy - either one could have powered the world's reactors. But it was uranium that won out, and thorium, which is far cleaner, safer, and more abundant than uranium, was relegated to the dustbin of science. With it went the possibility of creating a low-risk nuclear energy source to power our planet. Now, as the world searches for cheap, non-carbon-emitting energy sources, thorium is reemerging as an overlooked solution. As one of the first energy experts to promote the…


Book cover of Shantaram

Patsy C. Robertson Author Of A Concoction of Lies

From my list on thrillers in foreign locations.

Why am I passionate about this?

In elementary school, I was told I had an overactive imagination, an insatiable curiosity, and an adventurous spirit. Fortunate to live across the street from the school, the school’s tiny, nondescript library became a sacred place, a sanctuary, a peaceful and magical space where I could escape into worlds far beyond the limits of a small southern town in the 1950s. I incorporate all of these characteristics, plus my love of travel, into my books. My goal is to write thrilling multicultural fiction novels that depict the blended relationships and experiences of African Americans and people within the communities that make up the global African diaspora.

Patsy's book list on thrillers in foreign locations

Patsy C. Robertson Why Patsy loves this book

Give me an array of spicy Indian food, a handsome hero, and a good Bollywood movie, and I’m set for the evening. But this book transported me to a different period in Indian history. I teetered on a cliff's edge as the intrigue and drama of Lin’s tale unfolded. 

The story moves from one heart-stopping incident to another as it transitions through the gritty criminal underworld, congested streets, and overcrowded slums of India in the 1980s. It gripped me from the beginning and kept my earpods glued to my ears until the end. It was one of the most compelling biographies I’ve ever listened to.

By Gregory David Roberts ,

Why should I read it?

10 authors picked Shantaram as one of their favorite books, and they share why you should read it.

What is this book about?

Now a major television series from Apple TV+ starring Charlie Hunnam!

“It took me a long time and most of the world to learn what I know about love and fate and the choices we make, but the heart of it came to me in an instant, while I was chained to a wall and being tortured.”

An escaped convict with a false passport, Lin flees maximum security prison in Australia for the teeming streets of Bombay, where he can disappear. Accompanied by his guide and faithful friend, Prabaker, the two enter the city’s hidden society of beggars and gangsters,…


Book cover of The Secret: a Treasure Hunt

M. S. Spencer Author Of Hidden Gem: The Secret of St. Augustine

From my list on treasure hunts.

Why am I passionate about this?

For much too long a perennial student, I hold degrees in Anthropology, Arabic Studies, and Library Science. I’ve studied nine languages and lived or traveled on five of the seven continents. I do not hunt tangible treasure—gold or jewels or sunken ships; I hunt knowledge. My love for rooting out treasure troves of information began with my first job. I held passes to the Library of Congress stacks, where I tracked down sources on Ethiopian history. After months of unearthing mostly obscure references, I came upon the mother lode—the great explorers’ accounts. It was like finding a chest of doubloons. I was hooked on the treasure of the mind.

M.S.'s book list on treasure hunts

M. S. Spencer Why M.S. loves this book

In my book, the hero enlists his students in a treasure hunt using a book by Byron Preiss called The Secret as a guide. In 1982 Preiss traveled to twelve spots in North America, at each of which he buried a ceramic casque. Each casque contained a key that could be redeemed for a jewel. To find a casque, the seeker had to match one of twelve paintings to one of twelve poems. The hunt has lasted four decades and involves thousands of players. Only three of the twelve hiding places have been found. Be careful! The Secret has drawn in much more cynical readers than you.

By Byron Preiss , Sean Kelly , Ted Mann , John Palencar (illustrator) , John Pierard (illustrator) , Overton Loyd (illustrator) , JoEllen Trilling (illustrator)

Why should I read it?

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

What is this book about?

The tale begins over three-hundred years ago, when the Fair People—the goblins, fairies, dragons, and other fabled and fantastic creatures of a dozen lands—fled the Old World for the New, seeking haven from the ways of Man. With them came their precious jewels: diamonds, rubies, emeralds, pearls... But then the Fair People vanished, taking with them their twelve fabulous treasures. And they remained hidden until now...

Across North America, these twelve treasures, over ten-thousand dollars in precious jewels in 1982 dollars, are buried. The key to finding each can be found within the twelve full-color paintings and verses of THE…


Book cover of The Sign of Four

Jonathan Whitelaw Author Of The Bingo Hall Detectives

From my list on sleuths who aren't cops.

Why am I passionate about this?

I’ve always been besotted with crime fiction. As a journalist in Scotland, I got to experience real-life crime on a daily basis. And the world of cozy crime fiction became a very valuable, indispensable escape for me. So, when it came to coming up with my characters for The Bingo Hall Detectives, I knew that I had to create a cast, a setting, a mystery even, that would take me out of the relentlessness of the real world and into the confines of a bloody good read. And I’m so glad I did. The Bingo Hall Detectives series is very dear to me and I’m very lucky to be able to bring it to readers. 

Jonathan's book list on sleuths who aren't cops

Jonathan Whitelaw Why Jonathan loves this book

I know it’s a bit of a cheat to have Sherlock Holmes here as he’s one of, if not the most famous detective in all of fiction.

However, he’s not an official cop so I’m claiming him for my list.

I remember being gifted a complete works of ACD when I was around 14 for a birthday. And I absolutely adored it from the off.

Like so many other crime and mystery writers, the Sherlock Holmes stories have been a constant, a mainstay throughout my career.

The Sign of Four is the second adventure with Holmes and Watson. And I recently re-read it for the Bloody Scotland Book Club.

It’s remarkable how well it’s aged, despite being over 100 years old. The tropes, style, and attention to forensic detail that ACD shows off are still used in crime fiction today. A truly wonderful masterpiece. 

By Arthur Conan Doyle ,

Why should I read it?

3 authors picked The Sign of Four as one of their favorite books, and they share why you should read it.

What is this book about?

As a dense yellow fog swirls through the streets of London, a deep melancholy has descended on Sherlock Holmes, who sits in a cocaine-induced haze at 221B Baker Street. His mood is only lifted by a visit from a beautiful but distressed young woman - Mary Morstan, whose father vanished ten years before. Four years later she began to receive an exquisite gift every year: a large, lustrous pearl. Now she has had an intriguing invitation to meet her unknown benefactor and urges Holmes and Watson to accompany her. And in the ensuing investigation - which involves a wronged woman,…


Book cover of The Labyrinth of Osiris

M. S. Spencer Author Of Hidden Gem: The Secret of St. Augustine

From my list on treasure hunts.

Why am I passionate about this?

For much too long a perennial student, I hold degrees in Anthropology, Arabic Studies, and Library Science. I’ve studied nine languages and lived or traveled on five of the seven continents. I do not hunt tangible treasure—gold or jewels or sunken ships; I hunt knowledge. My love for rooting out treasure troves of information began with my first job. I held passes to the Library of Congress stacks, where I tracked down sources on Ethiopian history. After months of unearthing mostly obscure references, I came upon the mother lode—the great explorers’ accounts. It was like finding a chest of doubloons. I was hooked on the treasure of the mind.

M.S.'s book list on treasure hunts

M. S. Spencer Why M.S. loves this book

You don’t often find novels in which an Egyptian and an Israeli work compatibly together, but Sussman’s series featuring two detectives—one from Luxor and the other from Jerusalem—does just that. Teaming up to solve the murder of a journalist, they pursue the case to the site of a gargantuan treasure long buried in the sands of the Western desert. Having lived in Egypt, I would have read The Labyrinth of Osiris if only for the setting, but found it to be a beguiling mystery, with unusual, sympathetic sleuths, an unmatched setting, and, best of all, treasure.

By Paul Sussman ,

Why should I read it?

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

What is this book about?

From the international-bestselling author comes a “taut, entertaining archaeological murder-mystery-meets-spy-thriller” (Kirkus Reviews).
 
When journalist Rivka Kleinberg is brutally murdered in a Jerusalem cathedral, it’s a complicated case for detective Arieh Ben-Roi. Kleinberg had racked up a wide array of enemies exposing corruption in the halls of power—from international corporations and the Russian mob to the Israeli government.
 
Learning that Kleinberg was working on a story involving Egypt, Ben-Roi enlists the help of his old friend Yusuf Khalifa of the Luxor Police. Together they discover something far more sinister than a single murder.
 
Kleinberg was chasing a mystery spanning centuries—a timeless…


Book cover of Project Hail Mary

Brian Guthrie Author Of Rise

From my list on science fiction that you should definitely read.

Why am I passionate about this?

Ever since reading Heir to the Empire (Timothy Zahn), I’ve been fascinated by science fiction stories with amazing characters and intriguing concepts. I love finding a new story, especially one that isn’t being talked about, and falling into that world. I still get lost in the worlds of the Deathgate Cycle and Rose of the Prophets because they introduced me to concepts and places I’d never imagined or thought to imagine before reading them. I crafted a world and characters both familiar and alien because of these influences and I’m still drawn to them when I start a new book no one is talking about, like those on this list.

Brian's book list on science fiction that you should definitely read

Brian Guthrie Why Brian loves this book

From the moment I first began listening to the audiobook, I fell in love with this story. I was all in the moment Ryland Grace stumbled through answering the question “What is 2 plus 2?” The layering of the story, the threat to Earth concept, the educational presentation of very high-level scientific concepts to an audience of all ages, and the way Andy Weir made this reader feel so many emotions over a rock just keep drawing me back to it.

I literally just finished another listen less than a month ago and already want to go back to a story. I still don’t see many people talking about it. And the ending? Every story has its own perfect dismount landing, and this one nailed it.

By Andy Weir ,

Why should I read it?

98 authors picked Project Hail Mary as one of their favorite books, and they share why you should read it.

What is this book about?

Ryland Grace is the sole survivor on a desperate, last-chance mission—and if he fails, humanity and the earth itself will perish.

Except that right now, he doesn’t know that. He can’t even remember his own name, let alone the nature of his assignment or how to complete it.

All he knows is that he’s been asleep for a very, very long time. And he’s just been awakened to find himself millions of miles from home, with nothing but two corpses for company.

His crewmates dead, his memories fuzzily returning, Ryland realizes that an impossible task now confronts him. Hurtling through…


Book cover of Amazonia

Mark Terry Author Of Crystal Storm

From my list on science is trying to kill us all.

Why am I passionate about this?

Currently, the world seems concerned that artificial intelligence (AI) will destroy the world or at least put many of us out of jobs. Only a few years ago, a significant part of the population believed that COVID-19 was made in a Chinese laboratory and intentionally or accidentally leashed on the world, killing millions. This isn’t just a theme in tech thrillers; it’s a theme in life. Whether it’s nuclear weapons, genetic engineering, AI, or some other type of technology, there’s always a fear that it’ll do more damage than good and, at its worst, bring an end to the world. 

Mark's book list on science is trying to kill us all

Mark Terry Why Mark loves this book

For years, I tinkered with the idea for a novel—a pair of researcher-adventurers hunting for possible cures in the jungles of Congo to sell to a pharmaceutical company trip onto a type of venom that creates long life. I never quite got it off the ground, partially because my agent at the time hated the idea.

Then I discovered James Rollins’ book. A scientific expedition went into the Amazon and never returned. Years later, one of its members stumbles out of the rainforest. A former Special Forces soldier, he had gone on the expedition with a missing arm and came out with two intact arms.

The government sends Nathan Rand into the Amazon to track the expedition—of which his father was a member—and possibly find what scientific mystery could regrow limbs.

Exotic locale—check. Scientific mystery—check. Adventure—check. Technology that could destroy the world—check! I’m there. I wish I’d written this one.

By James Rollins ,

Why should I read it?

2 authors picked Amazonia as one of their favorite books, and they share why you should read it.

What is this book about?

From the author of ALTAR OF EDEN and MAP OF BONES comes another fantastic mystery adventure, this time set deep in the Amazon jungle.

Out of the inhospitable Amazon rainforest a man stumbles into a missionary village. Soon the CIA operative and former Special Forces soldier, his eyes wide with terror, is dead. The photograph of Agent Clark's corpse in the Brazilian morgue shows two intact upper limbs, yet Agent Clark had only one arm, the other lost to a sniper's bullet.

Nathan Rand's father led a scientific mission into the rainforest and never returned - the same expedition that…


Book cover of Interference

Mark Terry Author Of Crystal Storm

From my list on science is trying to kill us all.

Why am I passionate about this?

Currently, the world seems concerned that artificial intelligence (AI) will destroy the world or at least put many of us out of jobs. Only a few years ago, a significant part of the population believed that COVID-19 was made in a Chinese laboratory and intentionally or accidentally leashed on the world, killing millions. This isn’t just a theme in tech thrillers; it’s a theme in life. Whether it’s nuclear weapons, genetic engineering, AI, or some other type of technology, there’s always a fear that it’ll do more damage than good and, at its worst, bring an end to the world. 

Mark's book list on science is trying to kill us all

Mark Terry Why Mark loves this book

This novel has all the makings of a science fiction novel. But is it? Quantum physicist Matt Bronik is suffering from strange, violent seizures. He doesn’t believe they are tied to his research—studying quantum interference. But when he disappears, his wife Brigid is determined to find him. Is it Matt’s research into the universe’s deepest mysteries that has endangered his life? Is it Chinese competitors, the Department of Defense, or an unscrupulous billionaire? All of the above? None of the above?

Examining these books, it’s clear now that I really like thrillers where there’s science involved (and thrillers in general). I liked how this novel set a series of scientific puzzles in place and then knocked them down one by one. Because no matter how much science is involved, it’s matters of the human heart that can be the most mysterious.

By Brad Parks ,

Why should I read it?

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

What is this book about?

"Readers will fully engage with the well-drawn characters as Parks convincingly reveals the science that buttresses the suspenseful plot. Michael Crichton fans won't want to miss this one." -Publishers Weekly (starred review)

From international bestselling author Brad Parks comes an emotional, heart-pounding thriller that explores the scientific unknown-and one woman's efforts to save her husband from its consequences.

Quantum physicist Matt Bronik is suffering from strange, violent seizures that medical science seems powerless to explain-much to the consternation of his wife, Brigid.

Matt doesn't think these fits could be related to his research, which he has always described as benign…