Casino Paradise is an artificial island floating in New York Harbor. Domino, its operator, plans to use the $500,000,000 capital contained in the casino's three mobile safes to back his own run for president. Of the opinion that there is nothing he cannot steal, Lupin goes on a preliminary tour, and gets friendly with Nina, Domino's daughter. A big fan of Lupin's, she offers her assistance, but just then the artificial island is inverted through the strategy of Robert, Domino's campaign manager!