G-Man Chick Gardner, posing as a taxi driver, convinces the members of a counterfeiting gang that he is on their side and is taken into the organization by Philip Strickland, the boss, over the objections of gang lieutenant Flash Dillon. Gardner meets Gilda Lee, a member of the gang, and learns of the planned smuggling of a load of counterfeit money at a remote wharf. He arranges with the Federal officers to foil the landing but their presence is detected and the gang escapes, with Gardner being wounded in the mêlée by his own men. Dillon discovers Gardner's true identity and tells Gilda to take him for a ride. Instead, she helps Gardner kill Dillon, in return for which he promises her immunity. She goes with Strickland to the yacht of John Rudd, who is the secret leader of the counterfeiters. Gardner and the federal agents follow her.