一个受保护的证人在转移途中遭伏击，三名在场警察被杀害，负责这次转移的探长Lindsay Denton很快被怀疑串通罪犯，反贪组在调查Denton的同时，也在寻找真凶，但是事情似乎并不简单……

　　本季共4集，每两集一个案子。
　　Hattie Morahan饰演的Alice曾经也是布莱切利的一员，现在她面临谋杀的指控，马上要面临绞刑，Jean找回Susan、Millie和Lucy帮助Alice洗清罪名，却揭开了更深的内幕。
　　Susan离开英国前往印度，开始全新的生活，Millie却因为做黑市交易陷入了巨大的麻烦，甚至会有性命之忧……

　　故事描述女警官Catherine（Sarah Lancashire）带领一个调查组来到约克郡一处偏远的山谷调查一起绑架案，但很快发现案情线索复杂。在一连串多米诺骨牌式的事件发生后，这起案件引出了多起更加严重的犯罪。

　　Poole’s untimely and tragic demise brings Humphrey Goodman to the beautiful island of Saint Marie as the new Detective Inspector. But while he enthusiastically embraces Caribbean life, his new team of Camille, Dwayne and Fidel quickly realise they’ve got another eccentric and rather frustrating Englishman on their hands… Humphrey’s apparently random and disorganised approach to solving crime initially seems confounding, but it’s not long before they realise they have a remarkable detective in their midst – one capable of solving his predecessor’s own baffling murder - and together the team go on to brilliantly solve a host of dizzyingly mystifying murders, from zombie film stand-ins, to glamorous stewardesses and local politicians.

　　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.

　　《摩斯探长前传》第二季于2014年3-4月在英国ITV播出，新一季由《宝藏》、《夜曲》、《摇摆》、《永无乡》四个故事组成，单集片长为90分钟，Russell Lewis担任编剧，Shaun Evans继续出演主角警探摩斯，摩斯探长系列小说原作者Colin Dexter依旧为本剧担任顾问。四集导演分别由Kristoffer Nyholm、Giuseppe Capotondi、Andy Wilson、Geoffrey Sax担任。

　　本片由Gillian Anderson和Jamie Dornan联袂演出。片中Jamie的角色在白天是帅气慈爱的人父，但到了夜晚却成为冷血连环杀手，并与Gillian扮演的女警探展开角力。

　　本片始于英国男人马尔科姆（里斯·谢尔史密斯 Reece Shearsmith 饰）与其妻子克莱尔（谢里丹·史密斯 Sheridan Smith 饰）的婚礼，这对新人幸福的生活很快因马尔科姆的财政问题而产生裂痕。马尔科姆开始向克莱尔的食物和饮用水中投毒，他精心布局谋杀了妻子，从而骗取大笔保险金。数年后，马尔科姆娶了第二任妻子费莉希蒂（凯特·弗利特伍德 Kate Fleetwood 饰），因为财产问题，马尔科姆重施故伎，对妻子实施投毒，企图杀害她而获得保险金以及妻子原有的财产。然而，他的谋杀计划被及时阻止了。他的毒手继续伸向了第三名女性……
　　本片根据真实案件改编，此案为苏格兰史上最长诉讼案，马尔科姆因谋杀其第一任妻子克莱尔以及对第二任妻子费莉希蒂谋杀未遂，被判处终身监禁。

　　布朗神父（Mark Williams饰演）是切斯特顿笔下的著名侦探，矮个子，圆脑袋，身材胖儿可爱。手边常有一把标志性的大雨伞，他天性怕羞，说话有些结巴，看起来憨厚纯真，似乎与探案不搭边，却大智若愚，有着很锐利的直觉。