快递员（欧嘉·柯瑞兰寇 饰）经常骑着戴着高科技头盔的摩托车在伦敦巡游，她之前在特种部队服役，后来由于哥哥的牺牲离开了特种部队。一次任务中她发现自己运送的最新包裹是一枚炸弹，目标是一名犯罪集团老大（加里·奥德曼 饰）谋杀案的目击者后，她的平静生活被打断。犯罪集团老大被纽约检察官办公室指控，并有了对他不利的人证，于是快递员开始与时间赛跑，从腐败的CIA特工和俄罗斯雇佣兵手中拯救目标。

Ray 'Harley' Davidson is a hustler. With flash clothes and a fast mouth, Harley lives life in the fast lane. With his passion for all things gambling, money runs like water through Harley's hands and as quickly as he makes a killing he takes a beating, normally at the poker table. Nominally an illegal prize-fight manager, Harley hasn't produced a live one in months, until Charles Buchinsky literally wanders into his life. Charles Buchinsky, street fighter extraordinaire. He's from out of town looking for a fight and the chance to tie up a few loose ends. Keeps himself to himself, lets his fists do the talking and his word is his bond. Victor Maitland, top illegal fight promoter and porn baron. Hates losing and loves the prestige of managing the best hitter in town. Harley dreams of bringing Maitland down and after seeing Buchinsky at work, engineers a fragile partnership...