Sir Dan Blackwater, well known businessman and philanthropist is found dead one morning. Pinned to the kitchen table with butcher's knives, he has been castrated in what looks like a gruesome act of revenge. The only other person on the scene is his own PA, Sheena. But when DCI Charlie Trench brings her in for questioning, he discovers that she can't remember a thing about the events of last night - the shock seems to have caused her to lose her memory. Unsure whether to believe Sheena's story, Trench calls in forensic psychologist Karen Taylor. But as Karen begins her investigation, she will discover there is much more to the Blackwaters than ever met the public eye.