Cambridge is home to 18,000 students, 1,500 academics - and one serial killer. The discovery of the headless, mutilated body of a female undergraduate in her bloodsoaked college room heralds the start of a series of bizarre and extremely violent murders. For the students of Ariel College, a siege mentality has developed following weeks of media interest in the `Cambridge Butcher`. University life has become not about surviving their exams, but surviving full stop. Forensic psychiatrist Matthew Denison is sure that his traumatised patient, student Olivia Coscadden, has the killer`s identity locked up in her memory. That within the little clique she belonged to lurks someone with a grudge. Someone who has yet to finish settling their score. In order to get to the truth, Denison must delve into the secrets hidden within Olivia`s subconscious. Secrets that are about to lead him into a nightmare beyond imagining.