Welcome to the City Zoo, where the animals have a secret: every night after the visitors leave, they gather under the stars to play, laugh, and share stories. But when snacks start disappearing and strange noises echo through the night, Happie the hippo and her five best friends—Boon the elephant, Nara the parrot, Jin the otter, Ploy the tiger, and Yim the gibbon—find themselves in the middle of a mystery.

With teamwork, courage, and a little help from a mischievous raccoon named Bandit and a clever macaw named Rico, the friends uncover secret tunnels, hidden treasures, and unexpected truths. Along the way, they learn the true meaning of friendship, forgiveness, and working together.

Packed with colorful characters, heartwarming lessons, and exciting adventures, Happie and the Zoo Mystery is a delightful story that will keep young readers laughing, guessing, and cheering for Happie and her friends. Perfect for kids who love animals, mysteries, and tales of teamwork under the stars!