In the middle of a green forest, just under a spreading oak tree, there lived a little hedgehog called Johnny. Johny loved going for walks and playing with his friends Basie the squirrel and Frank the hare. One sunny morning, the three of them set off along a path covered with rustling leaves, looking for new adventures. Suddenly Basia stopped and pointed with her paw at something strange. "Look! What's that under the roots of the oak tree?" - she called out. The friends came closer. In front of them was a small circular entrance that they had never seen before. There was a smell of fresh earth and adventure. Hedgehog Johnny carefully slipped his nose inside. Suddenly, a quiet rustling sound came from inside the mink, and a mysterious shadow appeared on the wall. What could be lurking there? The friends looked at each other with wide-open eyes and....