"Auggie loves his job at the fabled stables, but he fears it will come to an end. Fen has hinted that caretakers don't stick around forever, and Auggie wonders if his days on the island are numbered. When Auggie gets the alert to rescue a mysterious creature called a Shibboleth, he hopes he can prove his worth once and for all. In a dark, damp dungeon, Auggie meets a band of Rooks, a curious girl, and one very hungry monster. With friends new and old by his side, Auggie must muster all his courage and cleverness to save the day." --,Back cover.