Bluffing Mr. Churchill

In 1941, the sheltered Calvin M. Cormack teams up with Walter Stilton, a rowdy MI5 officer, to find Wolfgang Stahl, an American spy masquerading as an SS officer, who flees Germany with valuable information on Hitler's plans to invade Russia, but Cormack must enlist the aid of Sergeant Troy of Scotland Yard after his partner turns up dead. Reprint.