Morse and Lewis investigate the death of Dr. Julian Dear, a senior fellow at an Oxford college. Dear was to participate in a debate on the evening of his death, where he was headed when attacked, suffered a fatal heart attack during what appeared to be a mugging. The College's Master, Matthew Copley-Barnes comes upon a young man leaning over the body of Dear, and the young man pushes the Master aside in his escape. Morse soon learns that Copley-Barnes has been receiving strange packages, and also that the College has large investments in Corby International, a major bio-agricultural/chemical firm. These facts and the interest of a well-known journalist, Sylvie Maxton, writing an article about the Master leads Morse to a complex cover up of scientific information as well as the discovery of a long-hidden tragedy.

Morse and Lewis investigate the death of Jackie Thorn who was found bound and stabbed in her flat. The murder is a carbon copy of one that occurred 27 days previously and they assume both were committed by the same man. The team is joined by Sgt. Siobhan Maitland, a expert in crimes against women. In the course of the investigation, they find that both women had purchased their cars from the same dealer and Morse becomes convinced that the owner, Jeremy Boynton, is the culprit. When they find a third assault victim who survived an attack some 5 years previously, Morse is more convinced than ever. The only thing now is that Morse needs evidence, provided he has the right man of course.

Trevor Radford, Managing Director of the family's Radford Breweries, is found murdered in the brewery. He had been working late one evening mounting a defense against an unwelcome takeover attempt from a rival brewery. There appears to be some disagreement in the family as to whether they should sell out. His brother Stephen, an entrepreneur in his own right, thought the time had come to rid themselves of a losing proposition but their father would like to maintain the family tradition that now spans 150 years. Morse and Lewis learn that Trevor's wife was having an affair with Stephen, so there is always the possibility that there this is a crime of passion rather than greed. They also learn of a long ago claim against the business' assets.

《摩斯探长前传》第四季于2017年1月回归独立电视台（ITV），本季共有四集，标题分别为《游戏》《圣歌》《检疫》《丰收》。剧情以1967年为背景，承接第三季结尾，由肖恩·埃文斯（Shaun Evans）和罗杰·阿拉姆（Roger Allam）主演，罗素·刘易斯（Russell Lewis）担任编剧，摩斯探长系列小说作者科林·德克斯特（Colin Dexter）担任顾问。

The indomitable DCI Vera Stanhope, assisted by her trusted colleague, DS Joe Ashworth, steps up for another series of challenging cases. She investigates the mysterious death of a pensioner on a busy commuter train (On Harbour Street), unearths a thirty year mystery after a brutal murder on the sands of a seaside resort (Protected), unpicks the tragic last months of a failed novelist gunned down on a remote Northumberland moor (The Deer Hunters), and delves into the tangled life of a businessman found floating in the water under the Gateshead Millennium Bridge (Death of a Family Man). Inspired by the novels written by renowned crime writer Ann Cleeves, and filmed against a backdrop of outstanding Northumberland landscapes and atmospheric production, each enthralling story is enhanced by the captivating performance of Brenda Blethyn as this shambolic yet brilliant detective.

Ironside is told by an anonymous caller that he is about to commit murder. Multiple calls from the same person give the chief details about the potential shooting - and time to prevent it.

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第四季将视野拓展到教育系统，其它主要情节还有第三季中引入的市长竞选，并深入描写了Marlo Stanfield领导的贩毒团伙在西巴尔的摩的不断壮大。