A sexual predator is on the loose in Denton. There have been a series of rapes and in all cases, he has broken into a home and waited for the victim to come home. The only exception is Emma Fox who, while driving home late one evening, finds that a man has hidden in the back seat of her car. The same evening, 17-year old Alison Cook has gone missing.A girlfriend thought she saw a man in an upstairs window but assumed it was her dad and thought nothing more of it. WPC Hazel Wallace is assigned to Frost and he decides to set a trap. Meanwhile, Frost is invited to a reunion in London for all Victoria and George Cross holders and the Chief Constable lets it be known that he expects Jack to attend. Only problem is that Jack has no idea where he's put his medal and can't find it.