Bruno Anthony thinks he has the perfect plot to rid himself of his hated father when he meets tennis player Guy Haines in Strangers on the Train. Guy is trapped in an unhappy marriage, and Bruno reveals that he feels trapped by his father, and proposes the theory of "exchange murders." Suppose that Bruno were to murder Guy's wife, and Guy in exchange were to kill Bruno's father? Guy takes this as a joke, but Bruno takes things into his own hands when Guy arrives home to find his wife murdered. (PG)