In this thriller, a baby-sitter is terrorized by an anonymous telephone caller who turns out to be a particularly persistent serial killer. When a stranger calls to ask, "Have you checked the children lately?" teenaged sitter Jill Johnson (Carol Kane) is understandably spooked. After a series of increasingly creepy calls culminates in a request for "your blood...all over me," Jill learns from the police operator that the man is calling from inside the house. One narrow escape and two dead children later, the police capture British maniac Curt Duncan (Tony Beckley). Several years later, the killer escapes from a mental institution and plagues Tracy (Colleen Dewhurst), a hard-drinking New Yorker. Foiled by John Clifford (Charles Durning), the same cop who investigated the original case, Duncan sets his sights back on his original victim, Jill Johnson, who, now married and out to dinner with her husband, has left her own young children at home -- with a baby-sitter. helped inspire Drew Barrymore's famous opening scene in Wes Craven's . Kane, Durning, and director Fred Walton would return for 1993's TV-movie sequel, . Beckley died a year after the original film's release.