Peter Collinson directed this nasty shocker that stars Susan George as Amanda, a teenage babysitter whose night looking after a couple's son goes horribly wrong. Suspicious from the start because of Mr. and Mrs. Lloyd's nervous manner, it isn't long before Amanda is jumping out of her skin every time she sees a shadow. However, the real terror starts when Mrs. Lloyd's psychotic ex-husband shows up, fresh from a mental institution, and tries to break into the house to exact revenge on the wife he hates.