Ramar and Prof. Ogden come across two botanists who have just, they claim, killed their native guide in self-defense. Believing their story, the men are offered lodging for the night at Ramar's camp. However, what Ramar and Ogden don't know is that the men aren't really botanists but narcotics traffickers in Africa looking for new supplies, and they are taking a great interest in Ramar's and Ogden's new--and unpatented--medicines.