Karlsson på taket smyger igen (Swedish)

"One day Little Brother reads a terrible headline in the newspaper: "Flying barrel or what?" The newspaper promises a reward of ten thousand kroner to the one who can capture that mysterious orb round! And of course it is none other than Karlsson on the roof, a handsome and wise and moderately fat man in his prime. But Little Brother, who is supposed to watch over Karlsson, gets it quite hardworking, and it doesn't get any easier when the house goat and uncle Julius get involved in the wild carousel.The third book about Karlsson on the roof."