The way of the wizard

"The wizard is discovered but at what cost? Jim and his friends have finally found Merlin the Wizard, but at a terrible cost. One of their teammates has fallen in battle, but Jim doesn't have time to grieve. He has to stop a feud between the River Trolls and the Garden Trolls, which has been going on for centuries. Once again the fate of the world is on Jim's shoulders. Is he up to the task?"--Provided by publisher.