Society sleuths Nick and Nora Charles investigate a murder aboard a floating casino. Nick and Nora Charles are attending a charity benefit aboard a gambling ship. After a murder occurs, suspicion falls on Phil Brant, who had argued with the victim earlier in the evening. When Phil and his wife seek help from Nick and Nora, Nick refuses to get involved. But when shots are fired outside his own apartment, Nick begins to investigate, and he soon finds himself in a confusing case with numerous suspects. Nick and Nora Charles were the ultimate screen couple, husband and wife detectives, always in step and never missing an opportunity to outwit one another as they solved each crime, which they did just in time for the movie's ending. Myrna Loy was a fantastic Nora, the ideal wife and considering she made 14 movies with William Powell, she made it look like they were really married. The Thin Man movies, all six of them, played more like sophisticated screwball comedies than murder mysteries, and their comic banter enhanced the proceedings. Their little wire-haired terrier, Asta, quite often stole the scene as he helped sleuth out the guilty party. He was a great little actor and rumor had it that away from the Thin Man movies, Asta was really Skippy. However, the six Thin Man movies credit this cute pooch as "Asta."
珊珊是警局的文员，她一直希望走到前线为民请命，除暴安良。常与好友巧伦及May幻想如何破案。珊珊闲时更会把破奇案的想法与网友天佑分享，天佑幽默而浪漫，很快便得到珊珊的欢心，二人渐渐发展成为网络情人。然而怪事地接二连三的发生，珊珊在网上所说的幻想，竟在现实生活中发生，初时珊珊还以为是天佑浪漫的安排，但发生的事却连火灾、车祸、凶杀都有，珊珊担心人身安全，她先后怀疑天佑、巧伦和May，没想到真凶竟是自...
赌王携外甥刘风、表妹凌兰提着钱箱来到“金钩赌场”。他的对手是日本人小野与山本，一番斗技之后，赌王赢得所有钱财扬长而去。重返赌场的赌王不顾巡捕罗义的劝阻依然来到金钩赌场约赌。原来，赌王的朋友被日本人杀害，截去了为抗战前线购买药品的钱，他要讨回这笔债。满脸怒色的山本见到赌王一行甚是得意，他望着莲心姑娘白碗里的两只骰子都是六点，脸上露出奸笑。赌王识破他的伎俩，技高一筹，把山本搞得目瞪口呆。赌王带着刘风和凌兰拿着满袋的钱冲出赌场。山本气势汹汹地逼问莲心，扫地的瘸腿老头心疼地劝莲心去投奔赌王。小野和山本的上司龟田请来韩国赌台高手“全扫光”，以天皇御赐的宝剑和赌王的传家珍宝夜光杯作赌注，一决雌雄。赌王和全扫光各坐一方，赌王举杯将酒一饮而尽。这时刘风、凌兰与日本浪人打斗起来，全扫光拿走夜光杯，说改日再决高低。全扫光在街上看戴大头娃面具的杂耍人变戏法。杂耍人在他胸前一抓，那只夜光杯到了杂耍人手中，等他觉得不妙，赌王等已无踪影。赌王深夜潜入全扫光住宅，两人厮打起来，巡夜到此的巡捕将两人抓进捕房。两个巡捕撕去伪装，原来是刘风和司机。在赌王和莲心的一番肺腑之言后，全扫光折服了，将那只天皇御赐的宝剑抛入湖中。赌王将钱款交给罗义，并让刘风到根据地去。回来的路上，瘸腿老人告诉赌王莲心和凌兰被日本人绑架。赌王赶到赌场，看见她俩被吊在梁上，身着和服的瘸腿老头一脸杀气，原来他就是黑龙会头目龟田。激战中，凌兰为保护赌王，自己却倒在血泊中，身负重伤的莲心挣扎着扣动扳机将龟田打死。罗义赶来营救赌王。枪战过后，赌场一片死寂。
