Michael Wong plays “Marty,” an English-speaking professional thief, who leads his gweilo gang in an elaborate heist to steal a very large diamond from a well-guarded museum on Castle Hill in Prague. Over some objections from his men, he decides to recruit is former sister-in-law “Mandy” (Shannon Lee) as additional muscle. The gang’s elaborate plot is derailed by a duo of petty thieves played by Jordan Chan and Anita Yuen – both of whom display talent for self-deprecating action comedy. When Jordan Chan’s character “Tommy” is discovered in the act of stealing the jewel, he swallows it. Marty’s gang mounts an assault on the police station to rescue him, and abducts his girl friend as insurance.