Strangers on a Train is a 1951 American psychological thriller film noir produced and directed by Alfred Hitchcock, and based on the 1950 novel of the same name by Patricia Highsmith. It was shot in the autumn of 1950 and released by Warner Bros. on June 30 the next year. The film stars Farley Granger, Ruth Roman and Robert Walker, and features Leo G. Carroll, the director's daughter Pat Hitchcock and Laura Elliott. The film is number 32 on AFI's 100 Years... 100 Thrills.
The story concerns two strangers who meet on a train, a young tennis player and a charming psychopath. The psychopath suggests that because they each want to "get rid" of someone, they should "exchange" murders, and that way neither will be caught. The psychopath commits the first murder; and then tries to force the tennis player to complete the bargain.