Stonewing

Tiffany Noboru fears her best friend Hedika has gone crazy when she convinces her to flee the Hollow Mountain, but their maddening flight soon becomes a cat-and-mouse chase, with the stakes being Tiffany's very life. Will the bizarre clues they discover along the way unravel the mystery about Tiffany and foretell a horrible end, or lead them to the one person who Hedika hopes can save Tiffany from total obliteration?