"Bertil is alone at home. He hears small tripping steps under the bed. It's a boy no bigger than a thumb - Nils Karlsson-Pyssling. He lives in a rat's nest under the floor. Bertil puts his finger on the nail next to the rat hole and says "the guy And suddenly he becomes as small as the tinker!The story of Nils Karlsson-Pyssling is here published as a picture book with illustrations by Ilon Wikland."