Korak at the Earth's Core (Edgar Rice Burroughs Universe - The Dead Moon Super-Arc Book One)

Korak the Killer, jungle-raised son of Tarzan of the Apes, sets off into the wilds of the prehistoric world at the Earth's core to rescue his daughter Suzanne Clayton, who has gone missing in the mysterious Land of Awful Shadow. But when the airship O-220 is hijacked, Korak and his Mangani friend Akut are stranded and must fight their way across the savage lands and seas of Pellucidar. Meanwhile, unbeknownst to them, Korak's mate Meriem, also racing to save Suzanne, risks everything in a perilous gambit to quickly reach the inner world.
And what of the enigmatic Dead Moon, the pendant world that hangs eternally above the Land of Awful Shadow and is taboo to the Stone Age peoples of Pellucidar? Will the Dead World give up its secrets as Korak and Meriem search for Suzanne-or will it spell their doom?
Bonus Novella: "Pellucidar: Dawn of the Deathslayer" by Christopher Paul Carey
When citizens on the far frontier of the Federated Kingdoms of Pellucidar begin to go missing, a lone warrior with nothing left to lose sets off to investigate. But the dark secret he finds lying in the Charnel Caves beneath the Forest of Death will lay bare the past he seeks to escape and awaken that for which he could never be prepared.