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Sergeant Stone and Pc Leon Taylor investigate when single dad Chris Cooper reports his 15-year-old daughter, Becky, missing. Later, Leon freezes when Becky is found beaten unconscious in an alleyway, and Stone forces him to snap out of it.
As Becky is taken to hospital, Stone and Leon head to a bar that Becky was in the previous night to begin their questioning.

Barman, Dave Patterson, says he vaguely remembers seeing Becky but when CCTV footage shows Becky and Dave having a huge row, Dave is arrested. Back at Sun Hill, Dave admits to having a relationship with Becky, who he thought was 19. He claims that Becky went mad when he tried to break things off after realising her real age, but insists he did not attack her.

As the investigation continues, Stone and Leon realise that the suspect is someone a lot closer to home and point the finger at Becky’s sister, Natasha. But as the officers try to question Natasha, she runs off, with the officers hot on her trail. The case is eventually resolved – but the day’s events have clearly forced Leon to tackle demons from his past.