When twin brothers Bill and Hal find their father's old monkey toy in the attic, a series of gruesome deaths start. The siblings decide to throw the toy away and move on with their lives, growing apart over the years.

In pursuit of a serial killer, an FBI agent uncovers a series of occult clues that she must solve to end his terrifying killing spree.

The residents of a lonely gulch in inland California bear witness to an uncanny and chilling discovery.