In a very ordinary house, on a very ordinary street in town lives Little Brother. 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 called Karlsson. He is, according to himself, a handsome, wise and fairly 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 will be the same.This is the first book about Karlsson on the roof, perhaps Astrid Lindgren's most controversial creation alongside Pippi Longstocking. Ilon Wikland has drawn the classic illustrations. She found the model for Karlsson on the roof in the halls of Paris, where she saw a small, reasonably fat man in a checkered shirt and blue trousers walking with a fruit cart.