Notes

399 p ill., map
Summary: When a mysterious envelope arrives for Jake Ransom, he and his older sister, Kady, are plunged into a gripping adventure. An artefact found by their archaeologist parents on an expedition from which they never returned leads Jake and Kady to a strange world inhabited by a peculiar mix of long-lost civilisations, a world that may be the key to their parents' disappearance - if Jake and Kady can survive long enough to solve the mystery.