Elliot and the Goblin War (Underworld Chronicles) [Kindle Edition] for $9.39

From School Library Journal Gr 3-6–This lighthearted fantasy approaches the world of goblins, brownies, and demons with tongue planted firmly in cheek. On Halloween night, eight-year-old Elliot Penster saved a little girl from having her candy stolen by two bullies. Unbeknownst to our hero, she was a magical creature known as a brownie, and the bullies were beastly goblins. With his simple act, Elliot set off a war between these two factions in their Underworld home.