这座城市出现了一名绰号“Blitz”的连环杀人魔，他神出鬼没地杀害多名警官，而他的凶器只是一把锤子。没人知道他的踪迹，而他也因作案手法老练而使警方难以破案。嚣张的他更在每次作案前后都会和某报社负责犯罪版块的编辑邓洛浦（大卫·莫瑞瑟 David Morrissey 饰）报告杀人的细节，从而追求社会的关注。邓洛浦为了自己出名而没有通知警方，每次都能让警方试图封锁消息的计划破灭，也因此被警方注意。
　　个性容易冲动火爆的警察布兰特（杰森·斯坦森 Jason Statham 饰）因正义感太强殴打嫌疑犯，屡次遭投诉、上报纸，上司颇为恼火。这一次，布兰特奉命追查这名凶手，面对凶残狂妄凶手的放肆挑衅，他决定要靠自己的双手，为这个社会伸张正义......

　　英国最强的男人在16年牢狱生活之后被放了出来，一个热爱英国的美国电影制片人找到他，开始了一段搞笑的英国黑帮生活拍摄之旅
　　After sixteen years at Her Majesty's Pleasure, Britain's hardest man is released from prison, and into the care of a documentary film crew headed by a Brit-loving American film-maker who follow him for the next week, on an hilarious roller-coaster tour of gangland London and beyond.
　　A fast moving, star studded, roller coaster ride of violence, madness and mayhem in this gritty British crime film. Bulla is the 'Big Fat Gypsy Gangster', labelled the most dangerous man in Britain. After serving sixteen years at her majesty's pleasure, Bulla is out on the streets again, but things start to go wrong from the moment he steps out and finds that he's lost everything on the outside world. Fleeced by the same corrupt copper that put him behind bars, even his favourite 'Aunt Queenie' is about to lose the roof from over her head; in Bulla's world family is everything. It's time for Bulla to fight back. Get ready for a white knuckle ride into London's underworld as the most dangerous man in Britain sets about reclaiming his crime empire.

　　【剧情】英国黑帮片“杰克三部曲”的终结篇，讲述前卧底警官Jack Adleth，返回伦敦寻找那些试图在阿姆斯特丹杀他的人。

　　英国海滨小镇布赖顿，凯特斯和卡林奥里两大黑帮组织盘踞于此，互相角力，此消彼长。某夜，凯特斯被对头当街杀害，视老大如亲父的平基（Sam Riley 饰）目睹了凶案的全过程，于是想参与者之一的福瑞德（Sean Harris 饰）展开追杀。福瑞德虽死，却留下一堆的麻烦，他生前为了躲避跟踪曾某餐馆女侍应生罗丝（Andrea Riseborough 饰），并与之留下合影。为了销毁证据，平基开始接近这名单纯的女孩，而罗丝也渐渐爱上了帅气冷酷的平基。与此同时，凯特斯的死亡也让布赖顿的黑帮势力失衡，一方面卡林奥里迅速扩张，一方面本帮内部展开权力争夺，平基深陷其中无法自拔……
　　本片根据Graham Greene 的小说改编。