Guilty? A year ago, Leo Stone was convicted of murdering two women and sentenced to life in prison. Now he's been freed on a technicality, and he's protesting his innocence. Not guilty? DS Maeve Kerrigan and DI Josh Derwent are determined to put Stone back behind bars where he belongs, but the more Maeve digs, the less convinced she is that he did it. The wrong decision could be deadly... Then another woman disappears in similar circumstances. Is there a copycat killer, or have they been wrong about Stone from the start?