The Emperor's armies have developed a new weapon: a thrown blade that can remove someone's head from long distance. As the paranoid Emperor begins decapitating anyone he fears might be a threat, his guard Mau Tang becomes disillusioned with the excesses of his master. He leaves his post and takes up the quiet life of farming and raising a family. Eventually, though, his past catches up with him, and he must find a way to fight the flying guillotine if he is to save his head.

在香港，提起赌术，没有人能不想起沙家。沙家是赌术世家，每代传人都是大名鼎鼎的赌王。到了沙通（宗华 饰）这一代，他更是将沙家的赌术发扬得淋漓尽致。年纪轻轻的他早已赌遍香港无敌手，赢得了“赌王”的称号。少年得志的沙通却一直有块心病挥之不去，那就是他的师傅此前遭“牌霸”石天（陈观泰 饰）的陷害，遭到了十年牢狱之灾。如不能为师报仇，沙通这个赌王怎么都当得不是滋味。石天会乖乖坐着等着沙通前来报仇吗？