这部由Emilia di Girolamo负责编剧的剧集讲述1992年的真实犯罪事件 - Rachel Nickell强奸谋杀案。当时警方认为Colin Stagg是真凶但却证据不足，而无奈之下年轻探长决定与国内一名犯罪侧写师合作，并进行一次十分大胆的卧底行动。Niamh Algar饰演卧底警员Lizzie James，她被指派接近嫌疑犯Colin Stagg并引诱对方。
After dealing with the repercussions of her actions from last year, DC Lisa Armstrong is given the opportunity to step up when asked to assist a murder investigation in Morecambe.
