Franek lived on the edge of a big, green forest. One sunny afternoon he met his best friend Lila. They decided to play hide and seek between the tall pine trees. Suddenly, behind an old bush, they saw something unusual. In the depths of the forest stood a huge tree whose leaves shone like coloured lights. The tree looked completely different from all those around it! Franek felt he had to come closer. Lila took his hand and together they moved carefully towards the tree. When they touched the bark, a tiny golden door appeared on the tree. Franek looked at Lila with wide eyes. "What's that door?" - whispered the little girl. Then the door began to open slowly, and from behind it came a quiet, mysterious sound....