Without having even talked to her, she seems to have already started to affect his life. He breaks off his relationship with his girlfriend and begins to reassess where he's going and who he is. The very next day the mysterious woman shows up at his apartment inquiring about the roommate wanted advertisement that Adam had placed. In the end she decides not to take the room and leaves.
On a trip out to his mother's we find out that Adam's father and sister both died ten years ago in a car crash. As his mother has reminded him that it is the tenth anniversary of their death, he decides to visit their grave on the way back into town. Mysteriously the woman is there also. They start to have sex but are chased away by a minister. Again she appears to vanish into thin air.
Adam receives a panicky phone call from his mother and rushes out to her house, only to find the mysterious woman there. She is claiming to be his sister. She and the father had been in France at the time of the accident and she claims that the French authorities had kept her alive in a coma for nine years, and she has just awoken recently.
Lilly has already convinced their mother of who she is, but Adam doesn't want to, and can't believe this strange woman is his dead sister Lilly. Unfortunately for him and his confused desires, she is able to supply irrefutable proof of her identity, by knowing things that only Lilly could have known.
The problem is that Adam hadn't been thinking of her as his sister, and isn't able to get those thoughts out of his mind. Lilly doesn't seem to be discouraging them either. She acts in a deliberately provocative manner, which results in what can only be described as a type of consensual rape.
Lilly had wanted this to happen so that she could have the excuse to reveal a secret. When they had both been children their father had sexually abused her while Adam had watched. She both hates Adam and wants him to devote himself to her. Eventually he makes the choice, and they become lovers.
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