Queen Ferris: Book Two of the Stoneways Trilogy

Reiffen, true heir to the kingdoms of Banking and Wayland, had lived his entire life quietly with his mother and best friends, Ferris and Avender. His days were filled with sailing, fishing with the talking seals, and trying to swipe as many extra maple candies as he could. 

All that changed when the three Wizards snatched Reiffen away to their fortress in the north. There they offered Reiffen the twin gifts of power and immortality--if he helped them wrest control of Banking and Wayland away from his uncle, the usurper. 

Although Reiffen's friends rescue him at great peril, Reiffen now decides to return to the Wizards knowing that he would never again be trusted in this old life--even his best friends would fear that the Wizards had "turned" him. He intends to fool the Wizards--gain their knowledge, find their weaknesses, and defeat them with their own weapons and regain the throne that is rightfully his. But Reiffen is forced to do terrible things to gain the Wizards' trust. Has he become as greedy, ambitious, and avaricious as the three Wizard brothers?