Dark Chamber (2007)

Ten years after striking out on his own, Justin Besler moves back in with his father to find that the sprawling family home has been converted into a small apartment building, and that a killer may dwell just down the hallway. When the corpse of a person who appeared to have been murdered in a ritual killing turns up on the property, the suspicious criminal law student quietly places residents of the tenement under surveillance. But for every dark discovery that Justin makes, he moves one step closer to becoming the next victim on the killer's list. Inspired by the true life "Say You Love Satan" murders, director David Campfield's twisting mystery thriller stars Sleepaway Camp survivors Felissa Rose and Desiree Gould.