"A double murder in a French chateau just after D-Day threatens Allied operations, and US Army detective Billy Boyle is called to investigate. July, 1944, a full month after D-Day. Billy, Kaz, and Big Mike are assigned to investigate a double murder, close to the front lines in Normandy. An American officer and a member of the French Resistance were found dead in a manor house outside the town of Trevieres. The investigation is shrouded in secrecy,...

"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 monsignor is found murdered at the foot of Death's Door, one of the five entrances to Saint Peter's Basilica. Wild Bill Donovan, head of the OSS, wants the killing investigated....

A German-sponsored IRA uprising is suspected when fifty Browning Automatic Rifles are stolen; Billy Boyle is sent to recover the weapons, but bodies accumulate as Billy finds unexpected challenges to his Boston-Irish upbringing and IRA sympathies.

"It's September 1944, and the US is poised to launch Operation Frantic, a shuttle bombing mission to be conducted by American aircraft based in Great Britain, southern Italy, and three Soviet airfields in the Ukraine. Tensions are already high between the American and Russian allies when two intelligence agents-one Soviet, one American-are found dead at Poltava, one of the Ukrainian bases. Billy is brought in to investigate, and this time he's paired,...

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...