A computer wizard infiltrates a London sex club to get evidence for a shutdown, but falls for the proprietress.

A human hand washes up on a Shetland beach. A few hours later, more body parts are discovered in a hold-all that has been dumped at sea. The victim is identified as a young Nigerian man, spotted in Lerwick a few days before. In investigating his murder, DI Perez becomes involved in the search for a vulnerable young woman, leading him to uncover a complex network of human trafficking across Scotland’s remote rural communities.

亚当·埃利奥特和格蕾丝·道格拉斯从小青梅竹马，在度蜜月回来后被残忍地杀害了。他们在苏格兰高地布雷斯顿村里的家人和邻居都感到十分震惊，完全陷入了混乱。当凶手在杀了他们之后的第二晚，开车前往他们家人的途中。一场暴风雨来临，他的车子翻出了道路。当两家人找到他时，发现他受了很重的伤，他们将面对一个可怕的困境...
在寻找答案的过程中，藏在背后的真相慢慢被揭开。每个人都有秘密，但在好与坏，真与假之间的界限模糊不清，你要如何面对永久的、也是最致命的后果呢？

BBC的关于大都会警察局“悬疑旧案”部门的喜剧。小组的头是女DS桑德拉普尔曼，既然是和旧事有关，索性就招聘了3个退休侦探：杰克把死去的爱妻埋在后院每天和她聊天，盖里年轻时有名的花心如今要和三个前妻四个女儿共进晚餐，布莱恩是个强迫症、前酒徒和阴谋论者。标题取自一句老话：“You can't teach an old dog new tricks（老家伙学不来新窍门）”。这帮老家伙却成功地在新时代用他们的经验和技，那些疑难案件正中了看似过时的老窍门的道。