This novel is about a psychiatrist, Jason Wallace, who becomes enraged upon discovering his wife Lisa's infidelity. Unable to cope with the affair, he develops a dreadful plan to get rid of her. He takes advantage of a patient, Josh Wit, who is diagnosed with DID (Dissociative Identity Disorder) to carry out his scheme. Jason becomes the prime suspect in the mysterious murder but ultimately pleads not guilty. All of the evidence, however, points at this vulnerable man struggling to gain control of his mental health condition.