Mari Hirakawa is a woman who inherits her father's karate dojo. However, she finds out that Chan Keung, her father's former student, is also its heir and they fight to determine its sole owner.
The final entry in Michael and Johnny Mak's Long Arm of the Law series, Underground Express once again tells a story of gangsters versus police, focusing on the difference between how both factions act depending if they're coming from Hong Kong or Mainland China.
