Strangers on a Train, by Patricia Highsmith

One key aspect of every version of Cape Fear is the way the story leverages the suspicion that civilized society can’t really protect us from an entity determined to ruin our lives. Highsmith’s novel plays on that same energy: When unhappily married Guy Haines meets wealthy Charles Bruno and admits his unhappy marriage, Bruno suggests they “swap” murders—Guy kills Bruno’s father, Bruno kills Guy’s wife. Since they are perfect strangers with no connection to each other, the police will be unable to solve the apparently motiveless murders. Guy doesn’t take the conversation seriously—but Bruno absolutely does, and is soon a malevolent force in Guy’s life.