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Though the fact was played down by the Universal-International publicity department, Step Down to Terror (aka The Silent Stranger) is a remake of the 1943 Alfred Hitchcock masterpiece Shadow of a Doubt. Charles Drake plays Johnny Williams, a psychotic serial killer who returns to his hometown to visit his mother (Josephine Hutchinson) and widowed sister-in-law Helen (Colleen Miller), both of whom are ignorant of his criminal past. Johnny hopes to settle down and start life anew, but Helen, her suspicions aroused by visiting detective Mike Randall (Rod Taylor), discovers the truth about her beloved brother-in-law. Failing to talk Helen out of turning him in, Johnny methodically plots her murder. Will Randall show up in the proverbial nick of time? Shadow of a Doubt was remade again, under its original title, as a 1991 TV movie.