Unemployed Czech-speaking writer Nicholas Whistler thinks he's got a job visiting Prague for a bit of industrial espionage. In fact he is now in the employ of British Intelligence. His pretty chauffeuse on arrival behind the Iron Curtain, Comrade Simonova, is herself a Czech agent. Just as well she's immediately attracted to 007's unwitting replacement.

重案組沙展馬軍（甄子丹飾）致力抓拿犯罪分子，身手不凡的他由于抓賊心切常常出手過重。警方一直搜集越南幫兄弟阿渣（呂良偉飾）、Tony（鄒兆龍飾）、阿虎（行宇飾）的犯罪證據(jù)，于是派出了華生（古天樂飾）以臥底的身份潛入他們之間。三兄弟為人心狠手辣，想鏟除掉眼中釘阿山。阿渣被抓后，Tony也識破了華生的真實身份，要將華生以及其他證人通通殺掉，救出大哥。華生女友秋堤（范冰冰飾）被挾持，華生不得不放棄指證阿渣。華生與女友都抓走當人質(zhì)，馬軍也帶著阿渣去營救華生。