John Mountjoy has escaped from prison and kidnapped the chief constable's daughter. The only person he'll parley with is Detective Peter Diamond, who arrested him four years earlier for the murder of a young journalist. Mountjoy, who still maintains his innocence, has a simple request for Diamond. All the detective has to do is find the real killer and clear Mountjoy's name, and the hostage will be free to go. But in the intervening four years, the trail has gone cold and memories have turned hazy, making the hunt for the killer even more complicated the second time around. Will Diamond get to the bottom of the cold case before another life is lost?