Young Marco Polo travels to China to help Kublai Khan fight against rebels, headed by his own son, with a new invention: gunpowder.

An art dealer wants to buy a Modigliani, which is tattooed on the back of an old soldier.

In Paris, a gold smuggler is at war with other local gangsters who want piece of the action. Then the mob shows up and makes things worse. And an undercover US Treasury Department agent is trying to infiltrate the smuggling business.