After his fathers death, Rufus returns to the house, where he spent his early childhood. He and his girlfriend want to spend some days at the lake, but after their arrival, strange occurrences happen. Figures seem to sneak around the house, trying to get in. Searching for traces of his childhood, memories come up in the mind of Rufus, leading him to the mysterious disappearance of his sister Sophie. In his visions he realizes, that she was put into an institute to be abused for clinical experiments. After her escape, she returned home, but her parents refused to let her in, being afraid of her violent behavior. Chased by the director of the institute, she then was drowned in the lake. Since this crime, she is haunting around the house, trying to get inside. After a night of revelation, Rufus decides to change the past, and opens the door to let Sophie in.