On the fourth floor of an apartment building somewhere in Stockholm lives Lillebror. Most of all, he wants to have his own dog. Up on the roof, in a small cabin behind the big chimney, lives a gentleman named Karlsson. He is, according to himself, a handsome, wise and moderately fat man in his prime. On his back he has a small propeller and with it he can fly... He decides to land with Little Brother. After that, nothing is the same.Karlsson does exactly as he wants - he eats all the sweets himself, always takes the biggest cake and likes to tease and tease people. He is completely convinced that he is the best at everything and likes to talk about it to everyone. He likes to get presents and make up fun things - and if something breaks or gets lost, it's a worldly thing and nothing to be upset about. Little brother loves that Karlsson makes his life an adventure.The big book about Karlsson on the roof is a collection volume with the three Karlsson on the roof books: Little Brother and Karlsson on the roof, Karlsson on the roof flies again and Karlsson on the roof sneaks again. The book has black and white illustrations by Ilon Wikland.