One day, Noah, Megan, Richie and Ella learned the secret of the city zoo, and now the children's lives are closely connected with this secret. While their peers are deciding how to spend the weekend, the combat scouts are preparing for a risky sortie. How can they stay away when their friends need help?! The polar bear Buran and the rhinoceros named Little Bighorn are planning to be euthanized by the wildlife control service. And three teenage paratroopers were captured by the shadowman de Graff. He wants to take over the magic of the Secret Zoo and turn its inhabitants into monsters... Noah comes up with a risky plan for a rescue operation, but de Graff is not wasting any time. New traps have already been set...