Under Two Moons: The Crystal Odyssey Book 2

Nissa, Madoc, their siblings and the Duke's son Kerr travel north to Solwintor to seek the source of Madoc's two books, written in a strange language. At a factory west of the town of Grenska they learn about a catastrophe a thousand years earlier caused by the formation of their world's second moon, and about the Stronghold, a cavern where people from many countries are attempting to recreate the lost crystal-based technology from before the catastrophe. Nissa, dismayed that she's assigned...