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In Back to the Stone Age, the fifth novel of Edgar Rice Burroughs' Pellucidar: the Inner World series, we join Von Horst en route to the remote land of Lo-Har, a journey of hair raising exploits among savage beasts and strange people, until finally he reaches his destination and wins the love of the beautiful La-ja. In the second complete novel in this book, our returning hero David Innes is travelling across Pellucidar from Lo-har, where he encountered Von Horst, to the land of Sari. When crossing a river Innes and his band of Sarians are attacked by bearded female warriors-and so begins The Land of Terror, another helter-skelter adventure through the Inner World written in the inimitable style of a master storyteller.