The gift will only be available after the treasure hunt. "This is easy," thinks Moritz, the birthday boy, and so everyone sets off. Right at the edge of the forest, things get tricky, as they need to identify different types of trees. Luckily, Viola, a biology student, comes by. She can explain a lot to them. On their quest for the solution word, they even meet the forester and learn a great deal about the forest from him. In the end, one letter is still missing. What gift is waiting for Moritz?.