One morning Tosia came to school in her beloved yellow backpack in the shape of a teddy bear. It was Friday, and therefore the day of her favourite games. As soon as she entered the cloakroom, she noticed that her friend Christopher was saddened. "What's wrong?" - Tosia asked. "I lost my new baseball cap.... I liked it so much!" - sighed Krzyś. Tosia wanted to comfort him. She reached for her backpack to give him a teddy bear sticker, but the the backpack suddenly disappeared! Tosia sat down in astonishment. Was this a joke? She looked around, but no one had touched anything. Suddenly she thought: "What if it was ME who made my backpack disappear?" She tried to think: "Let it reappear!" - and the backpack was back in its place! Christopher looked at Tosia with wide eyes. "Tosia, YOU have a superpower! Maybe with her help we can find my hat?" The children took each other's hands, and Tosia decided to try her new power in a big search.... And just then, when a strange shadow appeared in the doorway of the cloakroom and a mysterious rustling came from the locker, the children