如今，退休考古学家朱迪思·波茨、遛狗员苏西·哈里斯和牧师妻子贝克斯·斯塔林已成为新晋升的警探塔尼卡·马利克破案团队的固定成员，她们重返团队，并将她们非常规的破案方法应用于一系列备受瞩目的谋杀案。                                                                            　　从马洛镇最和蔼可亲的人——深受爱戴的镇长——的突然离世，到一位名厨被发现死于洗衣房，种种事件令人震惊。

　　The second series of After the Flood finds newly promoted detective Jo Marshall on the trail of a baffling murder investigation. As tensions simmer in Waterside amid the rising threat of moorland fires and the subsequent risk of further flooding, a body is discovered in bizarre circumstances. Jo's race to stop the killer will put her in opposition to dark, influential forces within the town, and ultimately take her on a much more personal investigation. One that will require her to operate in secret if she is to have any hope of rooting out the corruption that has blighted the town's police force - and her own family - for decades.

　　故事改编自安德鲁·莱恩的同名畅销小说，讲述年少生涩的夏洛克·福尔摩斯卷入一起牛津大学的谋杀疑案，他的自由因此受到威胁，这也是他人生第一桩案件。目无纪律的夏洛克因此要去拆解一起涉及全球的阴谋，也将永远改变他的人生。