A man takes his family on a camping trip and becomes convinced they are being stalked by the legendary monster of the New Jersey Pine Barrens: the Jersey Devil.

When housewife Frances Hannon is abducted and buried alive, detective Madeline Foster is brought in. With only 24 hours before Frances' oxygen runs out, Madeline pursues the trail laid by a killer calling himself Harry Houdini. After capturing him, Madeline brings Harry back to the police station, but is unable to get him to confess where Frances is buried. As time runs down, Harry gets inside the head of unstable, alcoholic Madeline.

Sarah Taylor, a police psychologist, meets a mysterious and seductive young man, Tony Ramirez, and falls in love with him. As a cause of this relationship, she changes her personality when she begins to receive anonymous telephone calls.

Gail and Tom Hartman are struggling to stay together and decide to take a white-water rafting holiday adventure in Montana for their son Roarke's 10th birthday, only to meet up with a pair of mysterious men whose desperation grows, turning their vacation into a nightmare.