Frederick Major Paull Knott was an English playwright and screenwriter known for complex crime-related plots. Although he was a reluctant writer and completed a small number of plays, two have become well-known: the London-based stage thriller Dial M for Murder, later filmed in Hollywood by Alfred Hitchcock, and the 1966 play Wait Until Dark, which was adapted to a Hollywood film directed by Terence Young. He also wrote the Broadway mystery Write Me a Murder.