The Sitter (1977)

Plot

A babysitter finds herself increasingly unnerved by a series of ominous phone calls while caring for her charges. As the night unfolds, the calls grow more menacing, blurring the lines between reality and her growing paranoia. With each ring, tension escalates, leading her to question who is on the other end and what their intentions might be. Trapped in a seemingly safe environment, she must confront her fears and unravel the chilling mystery behind the relentless calls, all while ensuring the safety of the children in her care.