An insurance investigator infiltrates a Pacific island relic-smuggling gang with his lock-picking skills, navigates perilous heists to help police bust the syndicate, and unravels the mystery behind his father’s disappearance.

In 1980s Hong Kong, troubled youth Chan Lok-kwun, a mainland refugee, struggles to survive in the Kowloon Walled City by joining underground fights. Betrayed by crime boss Mr. Big while…