1928年6月4日凌晨，日本关东军为了侵占我东三省，指使敢死小分队化装成“东北军”，在奉天三洞桥炸毁了大军阀张作霖的专列，爆发了震惊中外的“皇姑屯事件”。但令日本人万万没有想到的是：这个绝密的行动恰巧被一个中国姑娘连海华看了个一清二楚。连海华不但看见而且还拿到了直接罪证：这次行动的特别命令。为了不让这个目击者泄露出事件真相的秘密，日本关东军最高司令部下了死令：务必尽快将其抓住灭口！这个任务落在被号称为关东军“间谍之花”的樱川丽子的头上。樱川丽子不敢怠慢，立即展开了对连海华的一系列追杀。
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.
一宗谋杀案，令江湖酝酿大风暴。美籍华裔戏痴张细伦（王浩信饰）回港寻找演出机会，因缘际会下被警花顾欣颐（冯盈盈饰）委以重任，要他冒充社团四联帮坐馆的遗孤。在资深卧底高彬（张振朗饰）的协助下，细伦当上坐馆。及后，细伦多次向黑道头目苏芷珊（汤怡饰）、女明星庄明丽（高海宁饰）伸出援手；夜场大家姐姚清水（蒋家旻饰）、三个沒血缘关系的妹妹亦围着细伦团团转。细伦初涉江湖，与高彬成为最佳拍档，加上金牌打手陆秋（朱敏瀚饰）拼死保护，化解多个危机，却不知道社团背后，早已有惊天大阴谋在等着他……
该剧是继年轻夫妇艾莉森(夏洛特·里奇饰)和迈克(基尔·史密斯·拜诺饰)之后，《鬼魂》将重返第三季，他们意外地继承了一处宏大的乡村庄园，却发现这片庄园正在分崩离析，到处都是鬼魂。当一个历史纪录片小组来到巴顿豪斯拍摄时，艾莉森和鬼魂们震惊地发现他们正在探索的暗杀阴谋。。。
