The Lodger Movie (2009)

A couple rents out a room to a mysterious young man, who may or may not be guilty of a series of grisly neighborhood murders.

The tale of a serial killer in West Hollywood has two converging plot lines. The first involves an uneasy relationship between a psychologically unstable landlady and her enigmatic lodger; the second is about a troubled detective engaged in a cat-and-mouse game with the elusive killer, who is imitating the crimes of Jack the Ripper.