A government agent infiltrates a gang of Chinese immigrant smugglers and pursues their ringleader throughout the heart of the Southwestern desert.

A government agent investigates a ring that is smuggling Chinese aliens across the border from Mexico. His investigation takes him to the Grand Canyon. He finds a lost, dazed girl wandering around who has become separated from her companions. He and the girl are soon found by the smuggling ring and taken prisoner.—[email protected] [Inaccuracies corrected by crit74]