Tosia really enjoyed playing in the garden behind the house. One warm afternoon, when the sun was shining high, her cheerful kitten Felek jumped under a big old oak tree. Tosia ran after him and saw something unusual. Under the roots of the tree was a small, colourful door that she had never seen before! Felek started scratching the door with his paw, and Tosia heard a quiet whisper: "Come in if you're brave!" The little girl looked at the kitten, who winked encouragingly at her. With a beating heart, Tosia put her hand on the door handle. At that moment, the door began to glow with a bright rainbow light.... Would Tosia and Felek dare to enter the mysterious world? What is hidden behind the door? Maybe you can figure it out!