The death of her seriously ill mother in a fire devastated the good girl Anna (Emily Browning) and she even attempted suicide. After a period of mental rehabilitation, Anna was allowed to return to her long-lost home, where her father Stephen (David Strathairn), a writer, her close sister Alix (Arielle Kebbel), and her future stepmother, Rachel (Elizabeth Banks), who she did not know how to treat. During this period, Anna saw her mother's miserable and terrifying figure one after another, and her good friend Matt (Jesse Moss) claimed to have seen everything on the night of the fire. All signs indicate that Anna's mother did not die in an accident, and the sisters naturally locked the murderer on Rachel. Not long after, Matt was killed. The dark cloud once again shrouded Anna's family. This poor girl who was almost collapsed was at a loss between reality and illusion...