Billy Boyle World War II mysteries

A young Irish-American cop, Billy Boyle, is promoted to detective just at the time World War II breaks out. Sent to London on assignment, his "Uncle" Dwight D. Eisenhower, picks Billy to be his personal investigator. The first task he undertakes is to catch a spy who may have been planted in Beardsley Hall, home to the exiled Norwegian government. Accompanying him are an aristocratic Polish officer and a beautiful British WREN.

"Uncle Ike" (aka General Eisenhower) personally pins silver first lieutenant bars on Billy Boyle in Benn's stellar fifth WWII mystery (after 2009's Evil for Evil). In December 1943, Billy's leave with his British girlfriend in Italy is cut short. Orders send him to London to look into a Soviet officer's shooting murder, which may be retaliation for the execution of thousands of Polish officers in the Katyn Forest that's been blamed on the Germans...