The Murdstone trilogy

Award-winning YA author Philip Murdstone is in trouble. His star has waned. The world is leaving him behind. His agent, the ruthless Minerva Cinch, convinces him that his only hope is to write a sword-and-sorcery blockbuster. Unfortunately, Philip—allergic to the faintest trace of Tolkien—is utterly unsuited to the task. In a dark hour, a dwarfish stranger comes to his rescue. But the deal he makes with Pocket Wellfair turns out to have Faustian consequences.