In November 1942 the Allies are poised to liberate Algeria from the Vichy French regime, a client state of Nazi Germany. This is is hoped, will squeeze Rommel's Afirka Korps between two forces and sweep him from North Africa. But no one knows whether the French will greet the Americans as friends or foes. Based on family connections rather than experience, Billy Boyle, a young Irish-American cop from Boston, has become General Dwight D. Eisenhower's...

"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....

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, and the area is restricted; no one seems to know where the corpse could have come from. Luckily, Billy and Kaz have a comfortable...

"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...

"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,...

"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...

In southern France in 1944, Captain Billy Boyle works with French Resistance fighters to protect a Royal Navy Commander, uncovering a wide web of subterfuge and betrayal in the process. Southern France, 1944: What should be a simple assignment with a Special Operations Executive officer gets complicated quickly as Billy navigates the tensions between Resistance groups in the process of gathering information on Vichy officials and other collaborators...