Doppelganger

In every good, there is evil. In Holly Gooding there is something worse. Much worse.

A woman moves from NYC to LA after a murder, in which she is implicated. She is followed by what is apparently her evil alter- ego. She moves into a room for rent by a writer, and he begins having an affair with her, but after some strange things happen, he's not so sure if the affair is with her or her doppelganger.