What if you could turn the world the other way around and take a peek at what's on the other side? Perhaps if you did, you would find something you never expected.

Such as friendship. When Oscar meets a lonely little girl, it's the start of an adventure for both of them.

Together they make an unusual journey to two very different worlds, each beautiful and necessary. And it all begins when the little girl's tooth falls out... Translated from Polish by award-winning translator Antonia Lloyd-Jones. "Color and composition combine to beautifully express friendship and the wonders of the world"--Kirkus Reviews, STARRED "A delightfully unique and heartwarming story about friendship"--School Library Journal