Thus, Malone spends much time by himself, worrying about his compatriots.  He faces the prospect of staying in the camp, which had obviously been the scene of kidnapping and violence earlier, or he could find a new--and a potentially dangerous--place to contemplate his next move.  He opts to go back to camp and sleeps.  He awakens, surprised, to the scratched and pale face of Lord John Roxton.

Roxton's appearance betrays his activities, his gradual movement toward his own primitive origins.  His hair is disshelved, his face scratched and bloody, and his clothing (once neat and proper) is now in rags.  He voices the discourse of filth when discussing the ape-men who have sequestered the professors.

He observes: "The filthy beasts fingered me all over, and I feel as if I should never be clean again." (139). Roxton validates Malone's intuition that the Ape-men had been watching the expedition all the time.  At this point, Conan Doyle introduces a new set of themes and characters including the Indians of the plateau who are "little, clean-limbed, red fellows." These Indians, like the expedition, are at war with the Ape-men.  The two forces--the British and the Accalas--unite and attack the Ape-men dwellings.

Malone thus moves toward his primal beginnings, " I found myself on my feet emptying one magazine again, while cheering and yelling with pure ferocity and joy of slaughter as I did so" (145).  The males of Ape town are executed; the females and children held in bondage.

Now, Challenger and Summerlee have opportunities to catalog new species in the lake next to which the expedition has established its camp. Roxton shoots pre-historic monsters while Malone envisions their heads in the Roxton's Albany study.  The problem of leaving the plateau remains, and the Accala Indians, though pleasant, refuse to help the party.

The Indian prince, however, finally offers a map to Malone and bids him to secrecy.  This map reveals a passage from the caves to the outside world, and the expedition plans its escape.

Why do the Indians refuse to help the expedition?
Why does the prince, who had earlier refused to carry stores, offer aid to the men?