Marshall Freidman, head of Psychiatry at the prestigious Hunter Newman Center, made a terrible misdiagnosis concerning Rose Shaw. He thought she is a lovely, fragile, complex woman who loves him. In truth she is a dangerous woman about to give him a lesson in obsession, sexual perversion, and murder. Every belief that Marshall held no longer seems true. It wasn't love that changed him... it was evil. But how could the devil be so good?