• 第01集
• 第02集
• 第03集
• 第04集

《摩斯探長 第四季》圍繞著英國退休警探約翰·摩斯的破案故事展開。摩斯以其獨特的偵探方式和對細節的敏銳洞察力，解決了一系列錯綜復雜的案件。

　　Morse finds himself the subject of a murder investigation when his friend, Beryl Newsome, is murdered at a rehearsal of the Magic Flute and he foolishly touches the murder weapon. Morse is suspended and DCI Bottomley, with DS Lewis assisting him, is put in charge of the case. Morse feels that he was set-up and looks to his past to see who, among the many criminals he arrested, might now be setting about seeking revenge. When someone scratches masonic symbols all over his car and he is reported for erratic driving, Morse wonders if Masons may somehow be involved. When a large number of his personal items are found in Beryl's apartment, Morse is placed under arrest.

約翰·肖飾演的約翰·摩斯是一位嚴謹而深思熟慮的偵探。他有一句臺詞：“真相就像拼圖游戲的最后一塊碎片，一旦找到，整個畫面就清晰了?！?/p>

凱文·沃特利所扮演的角色是約翰的搭檔，羅伯特·韋斯特。他的臺詞是：“在我們這個行當里，有時候真相比我們能想象的還要復雜?！?/p>

杰弗里·帕爾默則飾演約翰的老友兼顧問，彼得·懷特。他的臺詞是：“每個謎題背后都隱藏著一個故事，我們的工作就是去挖掘它?！?/p>

在這一季中，約翰·摩斯和他的團隊繼續與犯罪斗爭，揭露了一系列令人震驚的陰謀和秘密。他們之間的合作與友情，在一次次的調查中得到了深化和體現。