On a blood-soaked mattress lies a dead prostitute, her limbs spread in a parody of ecstasy, panic and pain etched in her face. The scene matches in every detail a series of murders two years ago - murders that ended when irrefutable forensic evidence secured the conviction of Derek Tyler.But there's no way Tyler could have killed the latest victim. He's been locked up in a mental institution since his trial, barely speaking a word. So is there a copycat?All his years of experience tell top criminal psychologist Dr. Tony Hill that there isn't - but that would make the murders literally impossible. While Hill tries to crack Tyler, DCI Carol Jordan and her team mount a desperate undercover operation to trap the murderer - a decision that will have terrible consequences. Read Less