There is only one person in the entire house who is not ordinary and that is Karlsson-on-the-Roof.
He lives on the roof, Karlsson does. This alone is out of the ordinary. Things may be different in other parts of the world, but in Stockholm people hardly ever live in a little house of their own on top of a roof. But Karlsson does. He is a very small, very round, and very self-possessed gentleman – and he can fly! Anybody can fly by airplane or helicopter, but only Karlsson can fly all by himself. He simply turns a button in the middle of his tummy and, presto, the cunning little engine on his back starts up. Karlsson waits for a moment or two to let the engine warm up; then he accelerates, takes off, and glides on his way with all the dignity and poise of a statesman; that is, if you can picture a statesman with a motor on his back.