This film is a sequel to "When A Stranger Calls" in 1979. In the first episode, Jill (Carlo Kane) keeps getting strange phone calls when she is a babysitter, and there is always a strange sentence on the other end of the phone: "have you checked on the kids?" Jill asked the police for help, and the police told her a creepy news: these mysterious calls were made from her house! When she went to check on the children, they were all murdered. The sequel took place five years later, when Jill worked as a psychological counselor at a university, and the tragic events of that year were still deeply imprinted on her mind. One day, when Jill Schoelen, a college student, was working as a babysitter, she found someone hiding in her home. She turned to the police for help but in vain, so she turned to Jill, a university tutor, for help, forcing Jill to fall back into the horrible experience of that year.