Renowned psychiatrist Lillian Steiner is struck by tragedy when one of her patients dies under mysterious circumstances. The official investigation concludes that it was an accident, but the experienced doctor refuses to accept that explanation. Convinced it was murder, Lillian launches her own private investigation to uncover the truth. As she delves into the victim's dangerous secrets, she realizes that many people had a motive for the crime. Step by step, she moves closer to the truth while putting her own life at risk.