Paul B. Thompson 
Battle for the Brightstone [PDF ebook] 
Book III of The Brightstone Saga

Mikal must find Orry. The safety of the world depends on it. The rogue wizard, Master Harlano, captured Mikal’s magical friend. Inside the talking head lies the secret that can end all magic: the location of the Brightstone. If Harlano and his band of rogues can find and destroy the Brightstone, they would have unconquerable power, but Mikal will stop at nothing to defeat his former master. With the help of his trusty friend Lyra and werewolf Killeen, Mikal battles pirates, wizards, and dark magic. Who will get to the Brightstone first? Prepare for the final battle…