Steve Weston, a diamond prospector in Ceylon, is robbed of his precious stones. Left without money, he gets hired in a mine where he finds Alfred, the man who stole his diamonds, in the guise of the ruthless overseer. He, having recognized his victim, tries to get rid of him by blaming him in turn for theft. Having thwarted the attempt, Steve organizes the escape from the mine with the complicity of other whites and the help of a guard who owes him a debt of gratitude.