Christian, a fallen Angel, stumbles upon Sarah as she stands by the stairs of their tenement building, fighting off another attack of agoraphobia. She intrigues him because he discovers he can't read her history when he uses his divine sight and looks into her eyes. He soon discovers Sarah is not your average human, and she gains his undivided attention and then his compassion when he realizes he's not the only supernatural creature on Earth, and that she is the ultimate sacrificial lamb in the most frightening and sinister ways.