Doppelganger
The story follows Holly Gooding (Barrymore), who moves from New York City to Los Angeles after being implicated in a murder. She is followed by what is apparently her evil twin. While in Los Angeles, she finds a room for rent by a writer named Patrick. After some strange occurrences, it becomes less and less clear whether the woman is in fact Holly or her Doppelgänger.
Patrick soon starts to realize something is odd about Holly. As he spends more and more time with her, things heat up and he falls for her. He then finds out that Holly's brother, Fred, is in a psychiatric hospital after killing his own father. When Patrick finds out that Holly's mother was murdered and she is the prime suspect, he starts doubting her sanity. But by that time he is too attached to her and does not want her going to jail. So when her brother Fred is attacked and she once more is a suspect he decides he is going to get to the bottom of it, no matter what.
good versus evil, cult, murder, plot twist