Robert Wells, an American youth who was reared in China, goes abroad for his uncle, James Sanderson, to assist in the construction of a bridge for the Chinese Government. Ray Williams, construction manager secretly employed by Chinese imperialists whose aim is to impede construction, introduces Wells to a narcotic that when taken causes him to neglect his work. Wells is in a dissolute stupor when the wayward son of the Lord of Thundergate meets him by chance and, noting the striking resemblance between them, exchanges identities with Wells, who as a result becomes involved in a daring conspiracy culminating in romance with a Chinese-reared white girl and in his own physical rehabilitation.
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