This was a great psychological thriller! The characters were all so twisted in some way. There are so many times when I couldn't decide who to root for and who was the bad guy. They have so many issues and disturbing obsessions. I was kept on my toes the entire story. The characters were hard to like because they had so many character flaws. There is vengeance, manipulation, deceits, and betrayals.
The main character, Jessica Farris, takes the place of another girl in a psychology study on morals and ethics run by Dr. Shields. She needs the extra money, and all she has to do is answer some questions. Then Dr. shields takes a personal interest in her. The question is, is she trying to help Jess or is there something more going on?