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 to three months’ hard labor. But Billy is given an opportunity: if he takes on the incredibly dangerous mission...

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 is the home to Operation Tiger, the top-secret rehearsal for the approaching D-Day invasion of Normandy,...

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 Naples, have been found murdered. Lieutenant Norman Landry was found behind a supply tent with his neck snapped. Captain

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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 undercover, he insists on being assigned to a murder investigation there so he can try to help her.
 
An American...

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 he must proceed with caution. The Polish contingent is incensed over evidence that implicates the Russians in the murder of...

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 found dead in a manor house serving as an advance headquarters outside the town of Trévières. Major Jerome was far...

August, 1944: US Army Captain Billy Boyle is assigned to track down a French traitor, code named Atlantik, who is delivering classified Allied plans to German leaders in occupied Paris. The Resistance is also hot on his trail, and out for blood, after Atlantik's previous betrayals led to the death of many of their members. But the plans Atlantik carries were leaked on purpose, a ruse devised by a colonel to obscure the Allied army's real intentions...