In the town of Xanadu, far from prying eyes, hides a mysterious Menagerie, where all kinds of mythical creatures live: unicorns, dragons, phoenixes. Few people know about this place - and no outsider should know about it. Logan Wilde finds a real griffin under his bed and discovers the mysterious and dangerous world of the Menagerie, and at the same time meets the strangest girl in the seventh grade - Zoe Kan. Zoe in panic. Her family has been guarding and protecting the Menagerie for many centuries, but something terrible happened - the little griffins went missing, and if they are not found as soon as possible, the Menagerie may be closed. To save the cubs, Zoe is ready to break any rules - even turn to a stranger like Logan for help. But the main mystery is different: does someone really want to destroy the Menagerie? Who exactly released the griffin cubs into the wild? And why?