Mistmantle Chronicles, The: Urchin and the Heartstone - Book #2

When evil interrupts the coronation of Crispin, the squirrel, on the isle of Mistmantle, Urchin, guided by the Heartstone, must embark on a perilous journey to a hostile island where he, while battling against mad King Silverbirch and his sorcerer, makes a startling discovery about his own past.