Demented (1994)

To the outside world the old boarding house seemed safe and inviting tucked away on a treelined street in a cozy and quiet neighborhood But appearances can be deceiving One by one the boarders are about to learn its terrifying secret A secret theyll carry to their graves Demented is an exercise in unrelenting mindnumbing terror Based on a shocking true story the film is all the more horrifying because it really happened maybe in your own town