"Oh my gosh! One of the very best psychological stories I have read. 5 stars." --Goodreads review Is the killer on the loose...or standing right beside you? When art student, Aiden Blake, witnesses a gruesome attack on a London towpath, the police need him to identify the assailant without delay. But there's a problem: refusing to leave his canal boat and traumatised by the shock, Aiden is rendered mute by the horror of the event and...