Macao organized crime under-boss Tony Dumont rips the Syndicate off and disappears with a load of diamonds but the Syndicate men and the Hong-Kong police are chasing him around the world.

On an airliner bound for Hong Kong, Tony Dumont (Rory Calhoun) is attracted to a pretty novelist, Pamela Vincent (Barbara Rush), who returns his attention. The plane is held up by a hi-jacking gang and a shipment of diamonds is stolen. Dumont is actually the mastermind of a diamond-smuggling syndicate operating from Macao. Although warned by Mama Lin (Soo Yong), that he might lose his sweetheart, Jean Blake (Dolores Donlon), because of his attention to Pamela, Tony is so infatuated with Pamela, that he double-crosses the gang and follows Pamela to San Francisco, taking the diamonds with him. There, she brushes him off. Now hunted by both the police and the syndicate, he returns to Macao.—Les Adams / Hans Delbruck