The movie opens with the murder of
New York City Detective Lieutenant Danial Lombardy, his body discovered in
Hong Kong waters. Three strangers arrive on the same ship at the port of
Macao, then under Portuguese rule, off
colonial Hong Kong: Nick Cochran, a cynical, but honest ex-serviceman, Julie Benton, an equally cynical, sultry, and well-traveled night club singer, and Lawrence Trumble, a jovial traveling salesman who deals in coconut oil, silk stockings, cigars and
contraband. Corrupt police lieutenant Sebastian notifies casino owner and underworld boss Vincent Halloran about the new arrivals. Halloran has been tipped off about an undercover New York City policeman out to lure him into
international waters so he can be arrested by British police for the murder of Detective Lombardy. With only three strangers to choose from, Sebastian informs Halloran that Nick is the cop. Halloran hires Julie as a singer, in part to find out what she knows about Nick. He then tries to bribe a puzzled Nick to leave Macao, but Nick is interested in getting to know the curvaceous Julie better and turns him down. Later, Trumble offers the
broke Nick a lucrative commission to help him sell a hot diamond necklace, which he accepts as a means of getting a nest egg to start a life together somewhere with Julie. However, when Nick shows Halloran a diamond from the necklace, Halloran recognizes it as part of the same cache he had sent to Hong Kong only a week earlier to be sold. Now certain of Nick's identity, he lays a trap for Nick, who gets knocked out and taken prisoner. Nick is guarded by two thugs and Halloran's girlfriend and head
croupier, Margie. Worried that Halloran is planning to dump her for Julie, the jealous Margie helps Nick escape, with instructions to take Julie with him when he goes. The thugs discover Nick is missing and headed by Halloran's murderous henchman, Itzumi, pursue him on a wild chase down to the waterfront. When Trumble happens on the late-night fracas he tries to help Nick, and, mistaken by the thugs for him, is killed. Before dying he tells Nick about having used him in an attempt to entrap Halloran, and the police boat patrolling offshore to capture the dangerous fugitive from justice if he can still be lured beyond territorial waters. When Nick tries to get Julie to go away with him, he learns that Halloran has invited her on a trip to Hong Kong to retrieve his expensive necklace, a rendezvous he instructs her to keep. Nick lurks by the dock and disposes of Itzumi. Taking his place at the helm of Halloran's boat, he steers the unsuspecting kingpin toward the waiting police. After a violent fistfight with Halloran that leaves the mobster unconscious in the water, Nick swims him over to the British authorities. The movie ends with Nick and Julie in a clinch, implying they will head home together to the United States, she having earlier expressed her homesickness to him and he sharing that Trumble had cleared up an outstanding shooting charge against him in New York that had left him an involuntary exile ever since. ==Cast==