Lillebror lives in an apartment in a building in Stockholm, and what he wants most in the world is a dog.

Karlsson lives on the roof, in a little house hidden behind the big chimney. He is, according to himself, handsome, intelligent, perfectly plump, and in the prime of his life. He also has a small propeller on his back, which allows him to fly.

Lillebror adores Karlsson, but his mother, father, older siblings, and friends are convinced that Karlsson is Lillebror's invention. Karlsson laughs and says, "They are the real invention."

As soon as Karlsson appeared in Lillebror's life, everything became fantastic and exciting.

Illustrated by Ayesha L. Rubio.

Recommended age: 10+