本剧用倒叙方式讲述了一个连环凶杀案的故事，剧名“Rellik”就是“杀手”英文“Killer”的回文。在剧中犯罪事件之末将会在剧集一开始就公之于众，然后以受创伤﹑毁容的伦敦警探Gabriel Markham为中心，在回溯追凶过程中剖析该警探的故事。参与演出《雪岛迷踪》及《权力的游戏》的Richard Dormer饰演高深莫测﹑不屈不挠﹑具感召力的警探Gabriel，他痴迷于追捕一个在他身心皆留下伤痕的连环杀手。Jodi Balfour饰演Gabriel的拍档Elaine，她是个爽朗﹑有热情﹑急切讨好别人的警探。艾美奖提名者Sam Miller将执导该剧，编剧Williams兄弟及其公司将担任本剧的执行制片方。
Sarah's dilemma, between her feelings for George and her duty to her husband Rene, is exacerbated by a heartbreaking secret. James and Olivia's relationship is under pressure when the true parentage of baby George is threatened with exposure. Elizabeth Bligh's decision to leave Ash Park to explore a life of her own proves more difficult than she thought. Anna and Gino face the difference between the fairytale romance and the reality of married life. Independent lovers Carolyn and Jack try to move closer to a commitment. Through it all, Regina's manipulative behaviour weaves an impenetrable web around George. In the sleepy village of Inverness, sex, death and secrets are never far below the surface.