Marty Rogers and the Dawn of the Aegis (Book 3 of the Warlocks of Windham Series)

Marty Rogers, a reluctant hero destined to wield the ancient Aegis to stop Whinon the Wicked, a man corrupted long ago by the god of the underworld. After Whinon targets Marty's family, the fight becomes personal, pushing him into a battle for the fate of the mortal world. With help from his eccentric allies—including his uncle Jack, his friend Weasel, a mentor cat named Marcus, and the ancient gnome Magog—Marty must master the Aegis before darkness consumes everything he loves.