Pellucidar. Pellucidar Book 2

In this sequel to At the Earth's Core, return to the world of Pellucidar - an exotic, savage land at the centre of our Earth, an untamed wilderness where time stands still. When American explorer David Innes first discovered Pellucidar, he fell under the spell of the strange world, earning the respect of many, the undying hatred of a few, and the love of the beautiful Dian. Torn from the arms of Dian by trickery, Innes vows revenge and returns to the Inner World in his most exciting adventure to date.
But David Innes appears in Pellucidar far from the land of his beloved and is forced to cross a fierce, unyielding world to reach her. Inne's epic journey through the many strange lands of Pellucidar, including the brilliantly conceived pendant moon and Land of Awful Shadow, and his heart-pounding encounters with prehistoric beasts and strange peoples ranks as one of the best adventures ever penned by Edgar Rice Burroughs.