When a Stranger Calls is a 1979 psychological horror film. It was directed by Fred Walton and stars Carol Kane and Charles Durning. The film derives its story from the classic folk legend of "The Babysitter and the Man Upstairs" and the 1974 horror classic Black Christmas. Jill Johnson (Carol Kane) is babysitting the children of Dr. Mandrakis (Carmen Argenziano) at their home. When the children are asleep, Jill receives a telephone call from a man who asks her if she has checked the children. At first, Jill dismisses the telephone calls as a practical joke; however, as the calls become more frequent and threatening, Jill becomes frightened and decides to call the police, who promise to trace the caller if Jill keeps him on the telephone line long enough. Jill, frightened to extreme measures, arms herself as she receives one final call from the nefarious stalker. Soon after the conversation, Jill receives a call from the police, only to find out that the stalker is calling from inside the house.