Silent Voyages of the Last Winter — Meyari McFarland

The Silent Winter: floating library that drifted in the sky far above the highest peaks. Only three people lived on it, sworn to keep the evil books from infecting the world below. Or was there? Prince Cyrille returned to the Silent Winter, intent on locating a missing librarian. Alone, trapped, he had to find a way to not just survive but also defeat the evil of the Silent Winter.