After his mother becomes exhausted wheeling him around the room, Little Hobbin devises a way to keep his crib rolling and, with the help of the moon, rolls out of the house, into the street, to the end of the world, and into the sky.

In the cover painting by illustrator Lisbeth Zwerger we see the Moon, an enormous moon-faced personage in starry dark robe and tie and wearing a blue crescent-shaped hat, bending over one of the tall houses to look at Hobbin in his crib far below.