故事发生在1936年的英国伦敦，里奇（保罗·贝坦尼 Paul Bettany 饰）是一位拥有着大好前途的银行实业家。然而，事业上的成功却并不能弥补里奇婚姻中的缺憾，他和妻子玛德琳（奥莉维亚·威廉姆斯 Olivia Williams 饰）之间的关系早已经名存实亡。
玛德琳的妹妹蒂娜（海伦娜·伯翰·卡特 Helena Bonham Carter 饰）要来家中小住，蒂娜是一名艺术家，她那无拘无束的举止和古灵精怪的性格很快就吸引了里奇的注意，随着时间的推移，两人终于决定坦诚相待，越过了伦理和道德的界限。之后，蒂娜怀上了里奇的孩子，遗憾的是，孩子并没有能够平安的诞生，与此同时，里奇亦意识到，对于眼前所发生的一切，一直保持沉默的玛德琳并非一无所知。

爱尔兰刑事资产局侦探埃默·贝里（Emer Berry）领导的一次例行搜查显示，一名小毒贩一直从一个似乎无法追踪的来源获得大量资金——不是现金，而是毛坯钻石。当这些钻石与比利时的一系列爆炸案有关时，埃默被迫与警察局长克里斯蒂安·德容合作。

Sammy 'The Bull' Gravano was mafiosi. He started out as a soldier, but his talent for murder, including the slayings of his best friends, his wife's brother and his own boss, Paul Castellano, saw him rise to under-boss in the Gambino crime family. However, betrayals within the family saw him break the code of silence and became the highest ranking member of the mob to turn into a rat - 'a rat in a suit,- assisting the government to finally put away the Teflon Don, John Gotti.