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A priceless cache of blue diamonds cause criminal chaos in this grim action drama that is set in the Mexican jungle. The excitement begins with the robbery of an armored car carrying the valuable gems. Something goes awry and all but one of the thieves die violently. The sole witness to the crime then kills the surviving crook and hides the diamonds in the jungle. Later a gangster captures him and tries to force him to disclose their location. The gangster's moll takes pity on the fellow and helps him escape. The two then make a desperate bid for the border with both the crooks and the Diamond Syndicate Police in hot pursuit.