Symphony of Star Songs — Elizabeth Klein

Evil hunts brothers Dougray and Robbie as they seek the invisible Citadel of Gallenbreigh for the next crystal. Traps await them and time is slipping away. Soon all the demons will overrun Galfane as Morgran grows more powerful. Will they find the Citadel in time and escape the clutches of a lethal demon pursuing them which is poisoning everything in its wake?