Hotheaded cop Bill Chu (Lau Ching-wan) gets relegated to the Emergency Unit after a dustup with his inept boss. When the mob kills Chu's pal and ex-colleague (Francis Ng) during a turf-war hit, he rounds up his motley department cohorts and embarks on a mission of revenge against the gangsters. The pursuit of the baddies culminates in a hair-raising showdown atop a hijacked transport plane in this action thriller.