This action-packed mystery has Japanese adventurer Mr. Moto on an archeological expedition in a remote Indochinese jungle province. A beautiful young aviatrix on a secret diplomatic mission crash-lands on the island and tries to get the tyrannical ruler to help subdue an uprising led by a maniacal high priest. In the meantime, two American newsreel cameramen become involved in the scene. We soon find out that the ruler is in on the rebellion in order to increase his own wealth and power, so Moto intervenes by posing as the high priest. He rescues the beautiful girl and the cameramen, defeats the bad guys, and destroys their munitions site.