A crazy woman who lives in an old mansion thinks she's with her brother/lover, who lures victims to her.

Newlyweds Helen and Paul are honeymooning in a Texas cabin when Paul is murdered by an unseen assailant. Fleeing into the woods, Helen is taken in by Odie Pickett and his impoverished hillbilly family, becoming trapped in their isolated shack while the killer is still on the loose and wreaking havoc.