Jill Harlow chooses to babysit over seeing The Breakfast Club with her best friend to earn the remaining money needed for a dress. Once alone in the house with the children asleep upstairs, Jill begins to receive telephone calls from an unknown man. Initially dismissing them as pranks, she soon becomes anxious as the calls become more persistent and unsettling. Her attempts to understand why he's targeting her only heighten her fear forcing her to take extreme measures to ensure her safety.