Grumpy goblins

"When Squeaky the gremlin runs off with Owen's favorite book, the dragon twins follow him right into a goblin village. All Owen wants is his book back, but the goblin leader Grom the Terrible wants something else: to battle Owen. Can Owen beat Grom the Terrible in a battle to win back his book and save Ella and Squeaky from the grumpy goblins?"--Provided by publisher.