A complicated set of relationships by marriage (where each of a pair of married couples was previously married to their current spouse's ex) makes it more difficult for Barnaby and Troy to unravel the motive behind the killing of an ex-Army man who still thought he was commanding a squadron of fellow villagers. The appearance of a traveling band of nomads for a festival adds to the list of suspects, as well as a possible second victim.

When Emilyn Simpson is found dead in her house, DCI Barnaby's instincts all lead him to suspect murder. Although she was elderly and everyone seems to have liked her, it seem she may have seen something in the woods that she shouldn't have. There are numerous suspects: the local doctor who lies about his alibi, Iris Rainbird, the local busybody who seems to live beyond her means or her son Dennis, who is the local undertaker. Barnaby also receives information that a death the previous year may not have been an accident. When two other residents of Badger's Drift are murdered, Barnaby uncovers an illicit love affair that the protagonists must keep secret.

The Midsomer Worthy Writers Circle invites well-known author Max Jennings to one of their monthly meetings. The group's secretary, Gerald Hadleigh is opposed to to the invitation, but is outvoted. It becomes apparent that Jennings and Hadleigh knew one another at one time. When Hadleigh is found dead the next day, Barnaby and Troy begin looking into the backgrounds of the various Circle members and try to locate Jennings. When they do find him he is, as they say, incapable of assisting them with their enquiries. A second murder adds to the puzzle but in the end, the solution rests on learning of long ago events and a hidden family secret. At home, the Barbabys agree to care for daughter Cully's Russian Blue cat Killmouskie, with interesting results for Tom.

Death of a Stranger—When a tramp dies fleeing from fox hunters, the investigation uncovers a trail of murderous deceit.
Blue Herrings—A series of deaths at a nursing home causes the residents to suspect foul play.
Judgement Day—Midsomer Mallow has a shot at the Perfect Village title, provided it can keep a murderer at bay.
Beyond the Grave—Unearthly happenings in and around a local museum create an atmosphere of terror.

Garden of Death—One of the most beautiful spots in the county becomes a source of contention.
Destroying Angel—When a hotel owner dies, the manager misses the reading of the will that names him part-owner.
The Electric Vendetta—A mutilated body found in a crop circle leads some to suspect aliens have invaded.
Who Killed Cock Robin?—A murder mars plans for the upcoming wedding of the village squire’s daughter.
Dark Autumn—A postman is brutally murdered, and it turns out he was delivering more than the mail to village women.
Tainted Fruit—A wealthy young landlady fears for her life after she callously ignores the plight of an elderly tenant.

Called to the village of Midsomer Market to investigate someone's car being set on fire, Barnaby and Troy soon find themselves investigating the murder of Marjorie Empson who is found in her home bludgeoned to death. The focus of their attention is the the Reading Club, a group of five women who meet regularly not to discuss books in fact, but to manage a investment fund they have established. Two of the members were hoping to cash out their investments, but were prevented from doing so by the others. There are several other suspects, all in one way or another connected to the financial and investment world, but when a second member of the book club is killed, the police realize they may need to look for an altogether different motive.

When two bodies are discovered by the side of a fishing stream, Barnaby and Troy have yet more murders to solve. Isobel Hewitt had a zest for life that some can only hope for. She loves to drive her red Jaguar at top speed and generally enjoyed the finer things in life. Although loved by many, there were those who weren't quite so charmed by her. Margaret Seagrove was convinced that she was the member of the local fishing club using weighted lures in the local stream. Her nephew and his wife, with whom she resided, saw her as a burden now that she had spent most of her accumulated capital. The second victim is the local doctor, Duncan Goff, a well-known philanderer who had affairs with many of the local ladies. The police must first determine if both were intended victims or if one was simply in the wrong place at the wrong time.

A cave in of a local canal tunnel under restoration reveals the skeletons of eight individuals. While most of the skeletons are from a cave in when the canal was under construction in the 19th century, one is obviously of a more recent vintage. Dental records identify him as Eric Edwards who was reported missing in 1965. Supt. Barnaby delves into the history of the canal to see if he can find a connection. DS Troy is over the moon when he learns that he has qualified as a Detective Inspector and that there may be a job for him in another county. In what may be his last case in Midsomer, he follows up on an anonymous tip that teenagers are harassing a local hermit, Tom. When one of those teenagers is shot through the head, Barnaby leaves "Inspector" Troy in charge of the case.

《骇人命案事件簿》是英国独立电视台制作的一部长青推理电影集，取材于英国当代推理小说家Caroline Graham的作品，截至2010年为止共拍摄十三季81集。该剧以总督察Tom Barnaby以及他的年轻拍档Troy为主干，讲述二人凭借机智抽丝剥茧，悉破复杂凶案的故事 ，此外这两个人在查案过程中所不时表现出的幽默机智、亦庄亦谐也是此片受欢迎的原因之一。全剧在英国南部白金汉郡取景拍摄，漂亮的小村庄充满了浓浓的英伦风味，与命案本身的骇人听闻形成强烈反衬，为英式推理迷以及克里斯蒂小说爱好者们的必看之作。

智慧、勇敢与正义化身的侦探角色总是能受到观众的喜欢，丧妻的退休探长乔治·詹特利（George Gently）就是极具个性和强烈正义感的好男人，人们一提到他的名字就提心吊胆，因为他拥有能够制服伦敦臭名昭著的黑帮的铁腕手段。他和他的搭档约翰·巴克斯（John Bacchcus）一次次深入险境，解开了各种案件的层层谜团。
这部BBC出品的传统英伦侦探剧改编自作家艾伦·亨特的《乔治侦探》系列，在上个世纪60年代的英国上演了一幕幕老少搭档侦破案件的精彩故事。《乔治·詹特利探案》在澳大利亚、挪威、德国、比利时、荷兰、加拿大、印度、日本、法国、爱沙尼亚等多个国家播出，取得了不俗的收视成绩。
扮演乔治的马丁·肖是英国最受欢迎的演员之一，在他的表演生涯中，成功诠释了一百多个电视剧角色。同时，马丁·肖在戏剧舞台上更加活跃，凭借百老汇经典剧目《理想的丈夫》中的戈林勋爵这一角色，他赢得了托尼奖提名和纽约喜剧委员会奖最佳演员。而乔治的年轻搭档约翰的扮演者李·恩格里比，观众对他应该并不陌生，他就是哈利波特电影第三部《哈利波特和阿兹卡班的囚徒》中骑士公交车的车长——史坦·桑派。
两位不同风格的主演将经典的英伦侦探剧模式中个性十足的侦探乔治和不太情愿跟在他身后的年轻警察演绎的淋漓尽致，剧中两人配合默契，不乏幽默互动，面对扑朔迷离案件，一点点抽丝剥茧，最后查明真凶，是侦探剧迷们不可错过的佳作。