By Mac Barnett, Author & Jon Klassen, Illustrator. A young girl and her magical yarn transform a community in this stunning picture book by rising stars Mac Barnett and Jon Klassen. On a cold afternoon in a cold little town, where everywhere you looked was either the white of snow or the black of soot from chimneys, Annabelle found a box full of yarn of every color. It seemed like an ordinary box. But it turned out it wasn’t. For ages 4 and up.