(From the publisher):
Rumors that long ago a treasure was hidden in a city now buried under the Nevada desert lead Nancy, Bess, and George to join a college sponsored archaeological dig in search of the gold. An ancient stone with petroglyphs on it gives Nancy clues to the missing treasure and brings her danger from a thief who wants the treasure.
Original title: The Secret of the Forgotten City
Genre: Fiction→ Children & Young Adult→ Mystery