Olek and Zuzia were siblings who really enjoyed spending time outside. One sunny afternoon they decided to play in the forest behind the house. The forest was thick with the smell of conifers and the sound of birdsong. Olek had his teddy bear with him and Susie had a blue rucksack full of treasures she had found earlier: a pinecone, a button and a pink pebble. Wandering between the trees, Olek tripped over something hard sticking out from under a large, mossy stone. He bent down and discovered an old, yellow piece of paper. He unrolled it together with Zuzia - it was a map! It had trees drawn on it, a stream and, at the very end, a big star. - Let's go there! - cried Zuzia excitedly. - Yes, there must be something interesting waiting for us! - nodded Olek. They wandered through the forest, looking around for more signs from the map. On the way, they jumped over a log, met red squirrels and heard the babbling of a small brook. When they reached a huge old oak tree, they noticed that a shiny key lay beneath it. Suddenly they heard a quiet rustling somewhere behind the bushes.... Olek and Zuzia squeezed their breaths and looked at each other with wide-open eyes. The trees started whispering and the big oak tree seemed to want to tell them something. Would the key open the hidden box? Or does it lead somewhere further away? Suddenly from behind a tree looked out....