In Libreville, equatorial Africa, the territorial agent makes plans for them to travel to meet Dr. Lorentz. Once the safari is ready, Mahri, an Arab, leads Brady and Morgan on the four-hundred mile trek to Lorentz's hospital. The safari battles brush fires, fever, drought and storms, eventually reaching the Lorentz compound where Lorna informs them that her father has not returned from a journey to Green Hell. Later, Arobi arrives with the news that Lorentz has been killed by a monster living in the cauldron of a volcano and gives Brady a giant stinger that he removed from the doctor's shoulder. After Brady analyzes the stinger, he confirms that it belongs to a giant, deadly wasp. Although Brady advises Lorna to stay at the hospital, she insists on accompanying him, Morgan, Mahri and Arobi to Green Hell.