There are 20 books in the Billy Boyle World War II Mystery series. The newest book is A Bitter Wind which came out in 2025.

1
Billy Boyle

Book cover of Billy Boyle
“This book has got it all—an instant classic.”—Lee Child, author of The Hard Way
 
“It is a pleasure marching off to war with the spirited Billy Boyle. He is a charmer, richly imagined and vividly rendered, and he tells a finely suspenseful yarn.”—Dan Fesperman, author of The Prisoner of Guantanamo…
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2
The First Wave

Book cover of The First Wave
Praise for the Billy Boyle series:

“A meaty, old-fashioned and thoroughly enjoyable tale of WWII-era murder and espionage.”—The Seattle Times

“The World War II atmosphere and history are expertly handled.”—Denver Post

“Great fun. Benn knows his war history. . . . The novel introduces a batch of intriguing characters who…

3
Blood Alone

Book cover of Blood Alone
Praise for the Billy Boyle series:

“The brash kid from Southie is still open, direct and fearless in his manner (and in his wonderfully loose-jointed use of the English language) and in no danger of losing his cover as a ‘happy-go-lucky Yank.’ But even amid the excitement of the spirited…

4
Evil For Evil

Book cover of Evil For Evil
Fifty Browning Automatic Rifles have been stolen from a US Army base in Northern Ireland. His “uncle” Ike Eisenhower sends Billy to recover the weapons, which might be used in a German-sponsored IRA uprising. Bodies begin to accumulate as Billy finds unexpected challenges to his Boston-Irish upbringing and IRA sympathies.…

5
Rag and Bone

Book cover of Rag and Bone
The fifth Billy Boyle investigation

American Lieutenant Billy Boyle is assigned to London by his uncle, General Dwight D. Eisenhower, to investigate the murder of a Russian security officer in the buildup to D-Day. Billy recognizes that this is a politically charged case, pitting Allies against one another, and that…

6
A Mortal Terror

Book cover of A Mortal Terror

In his time investigating crimes for both the Boston cops and General Ike's European forces, Lieutenant Billy Boyle hasn't encountered a serial killer. But now it looks like he may--a serial killer with a particularly frightening agenda.

Two officers from the American troops stationed in Caserta, Italy, not far from…

7
Death's Door

Book cover of Death's Door
In this seventh installment of James R. Benn’s hit WWII-era mystery series, Lieutenant Billy Boyle goes undercover in the Vatican.
 
Lieutenant Billy Boyle could have used a rest after his last case, but when his girlfriend, Diana Seaton, a British spy, goes missing in the Vatican, where she was working…

8
A Blind Goddess

Book cover of A Blind Goddess
March, 1944: US Army Lieutenant Billy Boyle, back in England after a dangerous mission in Italy, is due for a little R&R, and also a promotion. But the now-Captain Boyle doesn't get to kick back and enjoy his leisure time because two upsetting cases fall into his lap at once.…

9
The Rest Is Silence

Book cover of The Rest Is Silence
The fog of war surrounding D-Day and Operation Tiger provides cover for one of Billy Boyle's grisliest investigations.

When an unidentified corpse washes ashore at Slapton Sands on England's southern coast, US Army Captain Billy Boyle and his partner, Lieutenant Piotr "Kaz" Kazimierz, are assigned to investigate. The Devonshire beach…

10
The White Ghost

Book cover of The White Ghost
In the Pacific during WWII, Billy Boyle must discover if skipper, and future president, Jack Kennedy is a cold-blooded killer.

1943: In the midst of the brutal, hard-fought Solomon Islands campaign between the Allies and the Japanese forces, Lieutenant Billy Boyle receives an odd assignment: he’s sent by the powerful…

11
Blue Madonna

Book cover of Blue Madonna
Billy Boyle, World War II US Army detective and ex-Boston cop, faces his toughest investigation yet: infiltrating enemy lines in France as the Allies invade Normandy.

May 1944: Captain Billy Boyle is convicted on spurious charges of black market dealings stripped of his officer’s rank, reduced to private, and sentenced…

13
Solemn Graves

Book cover of Solemn Graves
US Army detective Billy Boyle is called to investigate a mysterious murder in a Normandy farmhouse that threatens Allied operations.
 
July, 1944, a full month after D-Day. Billy, Kaz, and Big Mike are assigned to investigate a murder close to the front lines in Normandy. An American officer has been…

14
When Hell Struck Twelve

Book cover of When Hell Struck Twelve
In the 14th Billy Boyle mystery, US Army detective Billy Boyle and Lieutenant Kazimierz travel into the heart of Nazi-occupied Paris on a dangerous mission: ensure a traitor to the French Resistance unwittingly carries out a high-stakes deception campaign.
 
August, 1944: US Army detective Billy Boyle is assigned to track…

15
The Red Horse

Book cover of The Red Horse
England, 1944: Recovering from physical and psychological wounds sustained in the liberation of Paris, US Army detective Billy Boyle and Lieutenant Kazimierz are sent to a convalescent hospital in the English countryside—only to discover that St. Albans may have its own war secrets, including a killer.

"As historical detective series…

16
Road of Bones

Book cover of Road of Bones
Billy Boyle is sent to the heart of the USSR to solve a double-murder at a critical turning point in the war in this latest installment of critically acclaimed James R. Benn's WWII mystery series.

It’s September 1944, and the US is poised to launch Operation Frantic, a shuttle-bombing mission…

17
From the Shadows

Book cover of From the Shadows
US Army Captain Billy Boyle plunges into partisan warfare alongside betrayed French Resistance fighters in his seventeenth WWII investigation.

Southern France, 1944: Ex-Boston cop and wartime military investigator Billy Boyle is given a dangerous assignment—to extract a British Special Operations Executive officer from Crete and take him to France to…

18
Proud Sorrows

Book cover of Proud Sorrows
In the eighteenth installment in this fan-favorite WWII mystery series, US Army Captain Billy Boyle investigates a murder in a charming English village, where personal vendettas tangle with wartime espionage.

Norfolk, England, November 1944: After a series of dangerous missions in the South of France, US Army Captain Billy Boyle…

19
The Phantom Patrol

Book cover of The Phantom Patrol
An investigation into a gang of Nazi-affiliated art thieves Leads Billy Boyle directly into the line of fire at the catastrophic Battle of the Bulge.

Winter 1944: Months after the Liberation of France, ex-Boston cop Billy Boyle finds himself in Paris. It is a city reeling from the carnage it…

20
A Bitter Wind

Book cover of A Bitter Wind
To solve a murder at an English airbase, US Army Captain Billy Boyle must immerse himself in the fascinating and secretive world of WWII radio espionage.

Christmas Day 1944: After his last mission put him in the tailspin of the Battle of the Bulge, Captain Billy Boyle travels to southeast…