When Jill Johnson agreed to baby-sit the children of a doctor and his wife, she thought it would be a simple job. However, on that night she starts getting obscene phone calls from a maniac who...

When Jill Johnson agreed to baby-sit the children of a doctor and his wife, she thought it would be a simple job. However, on that night she starts getting obscene phone calls from a maniac who keeps telling her to check the children. The real terror soon begins when she learns that the killer is already inside the house.