No Darker Crime

From an Edgar Award–winning author: A suspenseful tale of murder and espionage in wartime England.
David Garth has been off in America, giving speeches on behalf of Britain's Ministry of Propaganda. Upon his return, he's surprised to receive an unsigned invitation to an address in Wimbledon . . . and even more surprised when he's approached by two agents of Department Z.
Mark and Mike Errol, agents of British intelligence's secret detective squad, request Garth's assistance on a mission that has already taken the life of one of their friends. Desperate for vengeance, the Errols are out to catch the cold-blooded killer known as "Frankenstein."
After finding his flat burgled and a body lying on the floor, Garth is willing to help the agents in hopes of clearing his own name. But this manhunt unearths a plot with international ramifications: to halt America's assistance in World War II.