Long Arm of the Law Part 3 is a 1989 Hong Kong action film directed by Michael Mak and starring Andy Lau, Elizabeth Lee, Max Mok and Elvis Tsui.

The core theme of the film is the attack of Mainland China and its unjust and brutal law and tells the story of an honorary soldier from China (Lau) who was falsely accused of robbery and illegally flees to Hong Kong, where he ends up working for the triads in order to save his lover (Lee) from being sold as a prostitute.

Honorary soldier Lee Cheung-kong was falsely accused for robbery committed by his friends in China and was arrested by Officer Mo Heung-yeung.

Cheung-kong's appeal was rejected and sentenced to death, but he successfully escapes his execution but was stabbed by Mo while running.

After arriving in Hong Kong, Moon was sold as a prostitute to repay debts, while Chicken Heart and his younger brother were taken in by triad boss Master Leung as labor.

Leung notices Cheung-kong's combat skills when the latter fights Snakehead, and his henchmen and offers to pay for his debt and a job at his construction site.