On a full moon,
Halloween night
of his twelfth birthday, Arden Wonder's best middle-grade friend, Happy Buckets, becomes a shape-shifter! He dramatically transforms into a silly, fun loving, carefree and brave werewolf, who isn't the least at all threatening. Happy the Shape-shifter isn't all that tamed either. Happy still has monster instincts that take over his personality, and he has no control over. But everyone in town doesn't know that.
Happy is looking for protection from his friends. There is a hunter Down Under in Australia named Benjamin Boogieman, who wants to destroy the boy. Arden doesn't realize that Happy is the last shape-shifter. An order to save his best friend from becoming extinct, Arden discovers an enchanted weapon at the Dreamporium where all the cool kids hang out after school, that can protect his friend. It's a supernatural wand that can help safeguard Happy from being trapped in his monstrosity. But if Happy isn't careful about how to use the magic wand, there could be consequences.