|One of William Castle's better efforts, this one is a lot of fun.
Two girls spend an evening together while the parents of one of them are away.
They decide to make prank phone calls and play a game which involves calling people at random and saying "I saw what you did - and I know who you are."
Unfortunately, one of the people they place a call to is a man who has just murdered his wife... and he decides to come after them!
Bolstered by a solid final 15 minutes, this one is an enjoyable - if too lighthearted (some of the performances are too campy for their own good) - suspense ride.