Author Astrid Lindgren
Original title Karlsson på taket
Country Sweden
Language Swedish

Karlsson is a very short, very portly and overconfident man who lives in a small house hiding behind a smokestack on the roof of a very ordinary apartment building, on a very ordinary street in Stockholm. When Karlsson pushes a button on his stomach it starts a clever little motor with a propeller on his back allowing him to fly. Karlsson is the best at everything, at least according to himself. But there is, in fact, one thing at which he excels: being a playmate to a young boy named Lillebror (little brother) who lives in this house with his family.
Karlsson is quite mischievous, often getting Lillebror in trouble, but everyone in the end - even Lillebror's family, his cranky uncle, and their dour housekeeper - grow to like Karlsson and appreciate his sense of humour, energy, and good nature.