Quatermain has lost his only son and is eager to return to the wilderness. He persuaded Captain John Good and the Zulu chief Umbopa to accompany him, they set off from the coast of East Africa, this time in search of a white race that lives north of Mount Kenya. They encounter a fierce battle with the Masai warriors, undergo a terrible underground journey and discover a lost civilization. As a result, a terrible underground journey takes place and reveal a lost civilization.