How Bomba was swallowed up in an earthquake and hurled into a subterranean cavern that promised to become a living tomb; by what a marvelous combination of nerve and good fortune he reached the open air and sunlight; how he finally found Jojasta after the latter had been fatally hurt by the fall of his temple; the partial but not sufficient information he received from the dying man regarding his parents; the obstacles he surmounted and the perils he escaped are told in the preceding volume of this series, entitled: “Bomba the Jungle Boy at the Moving Mountain; or, The Mystery of the Caves of Fire.”