A boatload of Westerners is trapped in Manchuria as bandits led by Russian renegade Voronsky ravage the area. Seeking refuge in a fortified inn, the group is led by the boat's Captain Carson, who becomes involved with a woman who "belongs" to Voronsky. Carson must contend with the bandits outside and the conflicting personalities of those trapped inside the inn, as well as dealing with spies among the inn's personnel.

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