Lily and Chen move from Hong Kong to London to make their fortune. Enterprising Lily has ambitions to open a restaurant business of their own but she fails to persuade Chen who prefers the security of a job as a waiter in London's Chinatown. Soho which forms the backdrop of much of the action, is Britain's nerve centre for the Chinese Mafia - the Triads. In the back streets and illicit gambling dens, the film gives a rare insight to the Machiavellian exchanges between rival Triad gangs. Trying to pay off his father's gambling debts; the innocent Chen accepts money from a Triad member, only to find that he is expected to pay for it by doing a heroin run. Terrified, he falls in with Lily's plan to move away and start up a business. However back in Soho a high ranking Triad member is planning to overthrow his leader, and Chen's unpaid debt could turn him into a pawn in a horrifying violent power struggle.