Ann Reed travels to a mysterious land following her father who disappeared into its interior many years ago. Ann falls in with Bob Moore and Joe Riley who have just been mustered out of the military and plan to join the Bob's father who is researching rumors of a miracle drug used by the witch doctor's of a mysterious tribe. The owner of the local trading post is determine to keep the scientists out of the area so he can locate a cache of jewels guarded by the tribe without outside interference.