Guy Haines, a tennis star who hates his wife, is approached on a train by a stranger, Bruno Anthony, who hates his father. Anthony offers a plan: each could kill the other's victim. No motive, no clue would link the two murders save the casual meeting of strangers on a train. Haines doesn't take the plan seriously, however, until his wife is suddenly murdered, and Anthony appears to demand that Haines keep his part of the bargain.

Two men meet on a train and discuss an exchange of murders, and when one man follows through he begins to stalk and pressure the second man to commit murder.

Features four thrillers directed by Alfred Hitchcock with various special features.