This is a juvenile novel concerning the discovery of the lost tomb of Pharaoh Akhnaten (also sometimes spelled Akhenaten). It is not science fiction. Silverberg also wrote a non-fiction book about this Egyptian ruler: The Rebel Pharaoh.
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Acknowledgements: Robert Silverberg for cause, support, and cooperation; Ken Seamon for graphics; Rodney Walters for books and info; Alvaro Zinos-Amaro for comments and content; and all the fellow fans who have sent encouragement, information, and translations.