Wendy, her husband Dan and their kids have just moved to the small town of Stull, Kansas, where Dan is the new pastor. But in this sleepy community of friendly neighbors, a horrific series of occurrences awaits them: Their teenage daughter is being tormented by grisly visions. Her younger sister has been marked for a depraved ritual. And deep within the heartland darkness, one of The Seven Gates of Hell demands the blood of the innocent to unleash the creatures of the damned.

A teenage girl thinks that the monkey she owns is her innocent pet, but it turns out to be something much more dangerous, an evil shapeshifter capable of unthinkable acts no loyal pet would ever be able to perform.