Franek lived in a small, colourful town with a red roof on his house and a large pear tree in the garden. Every morning he ate a slice of strawberry jam and hurried off to school, where a bunch of classmates were waiting for him. But Franek had a secret - he kept an invisible coat under his bed! When he put it over his shoulders, he became completely invisible, even to the cat Purr. One day at school, Mrs Iga announced a competition for the best drawing of a superhero. Franek really wanted to win. As soon as the break bell rang, he ran out onto the playground with his head full of ideas. That's when he noticed something strange: someone had left a big, shiny ball by the music room. It looked like a magical crystal and every now and then it changed colours - once it was blue, once it was pink, then suddenly it was full of stars! Franek felt his heart beating faster. Does anyone also have a superpower? Or is it a mysterious ball that gives powers to anyone who touches it? Franek slowly walked closer, but then he heard a quiet whisper: "Franek, only you can discover what's hidden inside..." The boy reached out his hand towards the sphere, and at that moment....