The crooks in London know how it works. No one carries guns and no one resists the police. Then a new gang appears that go one better. They dress as police and steal from the crooks. This upset's the natural order of the police/criminal relationship and the police and the crooks join forces to catch the IPOs (Impersonating Police Officers), including an armored car robbery in which the police must help the gangs to set a trap.
清末年间佛山镇咏春弟子荟集，梁赞是咏春嫡传弟子，他开医馆，行医济世，作风正当，功夫更是一流，常被一些无聊之人以挑战为名前来骚扰，但是从无一人能够战胜梁赞，而更为人乐道的是他常助官府辑拿罪犯，屡立大功但也因为被众匪徒视为眼中钉，除之而后快，天地双鹰就是如此，他们无恶不作，赞先生联合官府缉拿地鹰之后，地鹰越狱，与天鹰联手向梁赞展开报复……
