British businessman Tom is an opium smuggler in the early years of the Republic of China. The 'King of Darts' Wang Zha Xi uses all his daring skills to put an end to Tom's dastardly dealings.
Siu is a competent, intelligent, smart Hong Kong detective. The case of money smuggling and counterfeiting between Mainland China, Hong Kong and neighboring countries has always happened. Investigator Wong who works under the gang, together with Siu, decide to join forces to end them all.