Billy Boyle World War II mysteries

"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 novel inspired by the controversial Operation Tiger tragedy follows Billy Boyle's investigation into an unidentified body that has washed up on the beach near a secret training site for the approaching D-Day invasion of Normandy.

"Billy Boyle, US Army detective and ex-Boston cop, faces his toughest investigation yet: infiltrating enemy lines in France as the Allies invade Normandy. It's late May 1944. Captain Billy Boyle is court-martialed on spurious charges of black market dealings. Stripped of his officer's rank, reduced to private, and sentenced to three months' hard labor, Boyle is given an opportunity: he can avoid his punishment if he goes behind enemy lines to rescue...

"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, due to the highly confidential nature of the American unit headquartered at the Manoir de Castilly; the 23rd Headquarters Special Troops. This...

"Just days after the Liberation of Paris, Billy and Kaz are brought to Saint Albans Convalescent Hospital in the English countryside. Kaz has been diagnosed with a heart condition, and Billy is dealing with emotional exhaustion and his recent methamphetamine abuse. Meanwhile, Billy's love, Diana Seaton, has been taken to Ravensbruck, the Nazi concentration camp for women, and Kaz's sister, Angelika, who he recently learned was alive and working with...

"Following their mission in the Soviet Union, Billy, Kaz, and Big Mike are sent to southern France for what should be a simple assignment: to serve as security for Royal Navy Commander Gordon Stewart, head of the Special Operations Executive's Section F in Algiers. Stewart's mission is to work with Resistance leaders in liberated areas to gather information that will help track down Vichy officials and other traitors who escaped with the retreating...