One rainy afternoon, Kacper was climbing the creaking stairs to the attic of his house. He enjoyed rummaging through old boxes and discovering strange treasures. Suddenly, under a pile of colourful scarves, he found a huge, purple feathered hat. As soon as he put it on, the hat sneezed unexpectedly! Kacper jumped up laughing. A long, whiskered tail slipped out of the hat and started tickling Casper's nose! - Hello, Casper! - said the hat in a very cheerful voice. - I'm the Mischief Hat. Are you looking for adventure? Kacper opened his eyes wide. At that moment, the attic door slammed with a bang and lots of colourful bubbles popped out of the hat. One of them floated closer and closer to Kacper, and inside it something was moving....