It is the holidays. Hans, Karl and Otto want an adventure. With Otto's cousin, Elsa, they take an old boat and down the river, through a forest. They want to visit the warden of the forest; he is a friend. But near his house, they see a plane (a plane in a forest?) Who are the men in the plane? What are they doing? and where is the warden? Hans and his friends have certainly found an adventure!
