Rudi is angry. So angry that he doesn't even know where to put all that anger. The whole Rudi is raging. And suddenly, Rudi goes up in the air and lands - oh no - right on the anger cloud. There, the wise Jau-Jau is already waiting, and as always, he knows what to do. He tells Rudi stories that help uncover the mystery of anger: about the raging giant Rolfhardt, the grumbling pirate Rollo Pitrollo, the snorting dragon Otto Schamotto, and many other little heroes. Rudi learns how to deal with his anger. And when his quarreling parents finally land on the anger cloud too, Rudi has the solution that brings them all back down from their anger.