One sunny morning, Leon woke up and heard a quiet sound coming from the depths of the Old Forest. Next to him on his pillow, Fiki the rabbit was already sitting up and wagging his tail. - 'Fiki, did you hear that? - asked Leon. Fiki nodded his head and squealed softly. - We have to check it out! - decided Leon. The boy put on his wellingtons, Fiki jumped into his rucksack and together they set off towards the trees. The forest was green and fragrant. You could hear birds singing, but the mysterious sound was different. It sounded like giggling and rustling leaves. Leon and Fiki followed the sound until suddenly they saw something shiny under a big oak tree. There was a mysterious key lying next to it.... Leon bent down to pick it up, and then an even louder sound came from the bushes. Something or someone was there! Leon looked at Fikie, and the rabbit's eyes bulged. Would Leon and Fiki dare to see what was hiding in the thick bushes?