该剧以经侦处长萧剑（于毅 饰）侦查离奇车祸案开始，通过对“海翔集团”违法操控股市的调查深入，引发对神秘商业大鳄胥枫（郭京飞 饰）过去的创业史探究。而关键性证人的丧失、社会舆论的施压、死亡的主谋、胥枫身份的揭开，一桩桩一件件都将矛头直指二十年前的金融大案，在其后牵扯出更大的跨国洗钱集团。萧剑无意间得到了胥枫隐藏的日记，发现了胥枫苦苦隐瞒的另一重身份。强敌当前，施压在后，不懈追查的萧剑以责任感与使命感冲破重重困局，最终将庞大的金融犯罪组织一网打尽。
The disappearance of Sir Julius Hanbury - and the theft of several of his erotic paintings - provide a new puzzle for Morse to solve. Assisted by DS Lewis, Morse interviews everyone at Hanbury House and it is in the course of searching the grounds that he finds Sir Julius' body, appropriately enough, in the family mausoleum. The pathologist notes that he was the victim of a frenzied attack but the lack of blood at scene leaves the police to conclude that he murdered elsewhere. Sir Julius was a candidate to become the Master of an Oxford college and was known to have a have had a bitter rivalry with another candidate for the position. When Roger Meadows, a friend of the Hanbury's au pair, is killed in a car accident, Morse concludes that that he too was murdered. Jealousy, revenge and greed all play part in the deaths.
Henry Fallon, who is wheelchair bound and is suffering from a neurological disorder, apparently commits suicide and Morse has mixed feelings working on this case as he was once engaged to the dead man's wife, Susan Fallon. The body was found by his son-in-law Peter Rhodes, a local antiques dealer and the victim's wife was in London. When Fallon's doctor advises Morse that Henry didn't have the physical capability to hold a gun to his head, the police realize they may have a murder on their hands. When the police are told that the business arrangement between Fallon and Rhodes had fallen apart, they also have a suspect. Lewis is concerned that Morse is too close to Mrs. Fallon to be objective but in the end, the perpetrators are identified.
《摩斯探长前传》第一季于2013年4月在英国独立电视台播出，共由《女郎》、《赋格》、《火箭》、《回家》四个故事组成。该剧主人公改编自经典的侦探形象——摩斯探长，而饰演摩斯的Shaun Evans的表演也为这部剧添光不少，他将摩斯的个性表现的非常丰富，有点忧郁，有点张狂，又有点可爱。
