Lane and Garrett are teenage girls who are making prank phone calls one night while baby-sitting. To each caller they say, "I saw what you did. I know who you are." One call is to Ireland, who has just murdered his wife. Naturally, Ireland begins trying to track down the caller. Crawford plays a woman attracted to Ireland who begins to supsect he's a murderer. Though the plot is thin, the film offers a chilling atmosphere and the performances are effective.