February 14th, 1993. Sheffield United supporters remember it as the day their team won a famous victory against Manchester United. The date is lodged in Anna Young's brain for a different reason. That was the day her 13-year-old sister, Jessica, was abducted. Fast forward 20 years. The case has long since gone cold. But Anna won't let it die. She made a promise to look after her little sister. And it's a promise she intends to keep no matter how long it takes. A detective with one thing on his mind, Jim Monahan is equally determined to bring down a sadistic sex-ring. But everywhere he turns, he finds himself entangled in a web of political power and silence. Then comes a bizarre 20-year-old clue that might just blow the whole thing apart.