In the underground kingdom of Aurora some questions are being asked: What happened to Princess Portia's mother? Why is Codexus, the librarian, so intrigued by the word "Aztlan"? Can King Priam solve the "Down and Back" riddle? The answers to these questions lead to an even greater question: Can Percy Fitz find a way into the Measureless Cavern? Percy, this Outworld boy, is asked to do what no one in the 600 year history of Aurora has ever been able to do. He is asked to descend the Endless Falls and enter a cavern only known to the Auroraeans through speculation and myth. Thus begins the third book in the Adventures of Percy Fitz Series, with Percy, Princess Portia and Puma, the mountain lion, finding themselves in yet more danger.
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