One summer morning, Klara and her younger brother Maks went for a walk in the nearby forest. The sun was warmly warming and the birds were singing cheerful songs. Klara was wearing her favourite yellow dress and Maks was clutching a green plush frog under his arm. Under a large oak tree in the middle of the forest, they both noticed something that had never been there before - an old wooden ladder leaning against the branches. The ladder rose very high until it disappeared among the white clouds. - I wonder where it leads to? - whispered Klara. Maks looked at his sister with wide-open eyes. - Probably to heaven! - he exclaimed. Together they decided to climb the ladder. The steps were comfortable and it smelled sweetly of flowers all around. When they were high above the ground, they felt a light breeze and heard quiet laughter. Suddenly, a fluffy white cloud with eyes and a wide smile appeared in front of them. - 'Hi, I'm Fluffy, one of the Cloudcuckoos,' said the cloud and made a bow in front of them. - You are the first children to climb into our land in a very long time. Klara and Max looked around in wonder. There were other cheerful clouds flying around, some with caps, others with glasses or scarves. The whole land looked like a big, soft playground. - Come on, let me show you something special! - cried Fluffy and led the children through the soft clouds. After a while, they stopped in front of a huge rainbow door hidden in a puff of clouds. Owl looked at the children and whispered: - Something extraordinary is happening on the other side. But only the bravest can enter there.... Clare grabbed Max's hand and they looked at each other excitedly. Should they open the door and discover what waits on the other side?