A charming psychopath meets a tennis professional on a train and suggests that they each commit a murder on the other's behalf. However, when the deranged man goes through with his part of the deal, the sportsman faces a race against time to prove his innocence. Alfred Hitchcock's thriller, based on the novel by Patricia Highsmith, starring Robert Walker, Farley Granger and Ruth Roman.

A charming psychopath tries to coerce a tennis star into his theory that two strangers can commit the perfect crime by exchanging murders—each killing the other’s most-hated person.