Following the death of her husband, Kate moves back home with her young child to live with her sister. As she begins to rebuild her life, she quickly realizes that the Doctor for whom she works is really a psychotic serial killer, his victims murdered with snake venom. As she begins to unfold his dark secrets, she finds she is in as much danger as his victims.
Melanie is married to Tom, a controlling, cold and self-centered man who happens to be a prison warden. He finds her to be a liability to his career aspirations and secretly plans to have her kidnapped and killed, by Jack, a dangerous inmate.
Amanda, a brilliant aeronautical engineer, is enraged when her breakthrough design is stolen and patented by her colleague Brendan. When he is found murdered, she becomes the prime suspect and soon finds she is not only fighting for her design - but fight for her life - as someone out there is determined to silence her protest for good.
