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。
After a hostage rescue goes wrong, superintendent Sandra Pullman is put in charge of unsolved crimes. With little resources and no back-up she decides to recruit three ex policeman. However times have changed, unlike her new recruits. Jack Halford is yet to get over the loss of his wife, Brian Lane is over obsessed and over medicated, and Gerry Standing is not quite the ladies man he used to be. They may have the experience but it's not like the old days. Not only are they chasing criminals, but they are having to deal with a new police force which does not always appreciate their old style policing.
夕阳无限好，何需忧黄昏。超越传统侦探剧的模式，案件并非悬置在历史时空之上。
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