After gunrunner Gil Burris offers to
obtain weapons for a Chinese village, Wong, a highly respected
villager, accompanies Burris to Hong Kong wearing an antique
bracelet given to him by a village elder. In Hong Kong,
American Secret Service agent Tom Keene sees Wong selling jewelry in
the marketplace and admires the bracelet, becoming suspicious when
Wong refuses to sell it. While Tom sizes up Wong, his bumbling
sidekick Wally meets Viennese beauty Trina Vidor, who is on her way
to catch the boat for Macao.
Back at Tom's hotel, Mr. Colder,
his boss from the American Embassy, arrives to give Tom his next
assignment, which involves tailing Burris to Macao and putting a
stop to his gunrunning activities. In Macao, Tom spots Burris
in a nightclub, and Wally realizes that the woman with him is none
other than Trina. After Wong informs Burris of Tom's presence,
Burris and Trina quickly board a boat going back to Hong Kong and
are followed by Tom and Wally. Trina overhears Burris and Wong
plotting the murder of Tom and later confronts Burris, who had sworn
to her that he had gone straight.
After Trina warns Tom that he is in
danger, he offers her refuge in his stateroom and is later attacked
by a knife-wielding Wong. Tom manages to wrestle the knife
away, but instead of turning Wong in, he warns him that he should
never trust the white man who sells guns. Back in Hong Kong,
Burris begs Trina to give him another chance, and when Tom
telephones to invite her to a polo match, Burris encourages her to
go so that he can convince them both that he is innocent.
At the polo game, Trina reveals that she
had come to China to marry Burris and begs Tom to give him a chance
to defend himself, but when Tom accompanies her to Burris' warehouse
office, he is attacked from behind and taken prisoner. Burris
forces Trina onto the boat carrying the guns to Wong's village and
orders Wong to kill Tom. Wong, however, remembering Tom's act
of kindness, spares him, and Tom subsequently returns the bracelet,
which had fallen off Wong's wrist when the two men fought on the
boat. Taking no heed of Wong's warning not to follow him, Tom
swims out to the departing boat and finds a hiding place with the
help of Trina.
After the guns are unloaded at Wong's
village, Tom sneaks off the boat in order to stop the transaction,
but when a villager throws a torch at him, a fire starts that soon
ignites the entire village. Attempting to return to Trina and
the boat, Tom is shot in the arm by Burris, who takes him and Trina
captive. Burris tells Wong that it will be necessary to hide
the ammunition on a nearby deserted island until things blow over,
and Wong becomes angry and suspicious because his village has
already paid in full for both the guns and ammunition.
When they reach the island, Tom and
Trina are forced into a cave where at high tide they will drown, and
before he leaves, Burris boasts of his plan to double-cross the
Chinese by keeping their silver and selling their munitions to
another village. After overhearing Burris brag about his
scheme, Wong confronts him and is shot, but manages to attack Burris
with a knife.
At nightfall, a ship's captain notices
an explosion on the island and, going ashore to investigate, finds
the cold body of Burris and the still warm one of Wong, who he
surmises was killed by the explosion he set off to attract the
passing ship. Tom and Trina are rescued from the cave just
moments before being engulfed by the tide, and the next day,
newspaper headlines announce that they have married. On board
the ship taking them to their new home in the States, Tom slips
Wong's bracelet on Trina's wrist, and they kiss as the ship puts out
to sea.