Cuba loved to play in his room, where he had lots of blocks, cars and teddy bears. One day, as he was putting together a tower of blocks, he heard a quiet knock. He looked around, but no one was standing in the doorway. Puzzled, he noticed that there was a small wooden door behind the wardrobe, which he had never seen there before. Cuba walked closer. There was a golden handle hanging on the door and a key inside. The boy looked at his favourite teddy bear, Adas, and asked in a whisper: - Shall we go in? The teddy bear, as usual, was silent, but Cuba felt it was a great idea. He carefully turned the key and opened the door. Behind them he saw a forest full of colourful, glowing trees. Flowers were laughing at him and little silver creatures were hopping between the branches. Cuba took a step forward and took Adas by the paw. Then from behind one tree he heard a whisper: - Help us, quickly! Kuba looked in the direction of the voice and saw something very strange....