改编自埃里克·爱克斯尔·桑恩德 (Erik Axl Sund) 的瑞典犯罪小说《Kråkflickan》，背景移至英国。身份不明的年轻男子的尸体开始出现在城市各处，他们被殴打并充满了麻醉剂利多卡因，DCI 珍妮特·基尔伯恩（伊芙·迈尔斯饰）和搭档 DI Lou Stanley（多格雷·斯科特饰）正在追捕凶手。由于缺乏证据，破案压力越来越大，珍妮特寻求主要嫌疑人卡尔·洛瑞的心理治疗师索菲亚·克雷文博士（凯瑟琳·凯利饰）的帮助，后者对该案提供了一个新鲜但令人不安的视角。但随着凶手离家越来越近，珍妮特和团队正在与时间赛跑，解开这个秘密网络，解开这个谜团。两人发现自己陷入了历史性虐待和警察腐败的危险世界，尸体数量不断增加，凶手正一步步逼近家中。

　　Set in picturesque Bath, the series pairs feisty DCI McDonald, who has recently transferred from London’s Met Police, with the unassuming DS Dodds, who has been happily in the background for most of his working life. To McDonald’s surprise they form an unexpectedly effective crime solving partnership.

　　After the tragic events of the series one finale, our team of embattled prison officers, led by Leigh Henry, are determined to make a fresh start. But as those behind the cell doors of C Wing know only too well, moving on isn’t always simple. With changes at the very top and fresh faces both on the wing and in the staff room, Leigh’s new bond with Rose - and the secrets they share - will be tested to the limit.　　As the whole team struggles to make a difference to the complicated lives in their care, rumours of an undercover policeman on the wing not only threatens order at Long Marsh, but could blow open a criminal plot involving at least one of our officers. And one way or another, the truth will come out…