Kirby (Jack Hogan) is accosted by two American GIs, Roberts (Nick Adams) and Driskoll (Roger Perry)--one of whom takes a shot at him. All three men are subsequently taken prisoner by British corporal Tommy Behan (Gavin MacLeod), who is convinced that they are German infiltrators. To be sure, there is a German spy in the vicinity...and Kirby begins to suspect that the "ringer" is Behan himself. ~ Hal Erickson, Rovi