Urchin and the Heartstone is by M.I. McAllister. The second in The Chronicles of Mistmantle series. When a delegation arrives from the island of Whitewings asking for Urchin's help he is tempted to go - as soon as Crispin is crowned king. Then he finds himself kidnapped and taken to Whitewings against his will. Once there he discovers he must save the island to save himself. As Crispin seeks to rescue Urchin, he discovers the Heartstone is missing and he can't be crowned without it. An excellent sequel to the first book. Fans of the Redwall series will love this one as well.
Ratings: 6th grade - 8 out of 10.