Jane Lindskold, "The Buried Pyramid (Tor Fantasy)" (Repost)

Plucky young Jenny Benet, a recently orphaned American girl who was raised on the Wild West frontier and educated at a Boston finishing school, has come to Egypt in company with her uncle Neville Hawthorne, a prominent British archaeologist. They’re part of a team investigating the legendary Buried Pyramid, the tomb of the pharaoh Neferankhotep — who may also have been Moses the Lawgiver.