Londoner Harry Fabian is just a second-rate con man looking for an angle. After years of putting up with Harry's schemes, Mary, his girl friend, becomes fed up when he pops her . His ploy, boosting a Greek wrestler, goes awry when the wrestler expires and everybody points the finger at Harry. As the underworld shuts in Figuring out at a river front barge, Harry sees his grand ambitions spiral to a nightmare of desperation and fear.