Every night, the moon outside Willoughby's window gets smaller, and smaller, and smaller . . . until one night it disappears!
But Willoughby isn't afraid of the dark. Not really. He just wants to know where the moon went.
When he finds it in the most surprising place, he sets off on a magical adventure and meets a new friend who seems to be scared of lots of things—moon buggy rides, space pods, big rocks. . . . But it's Willoughby who has to overcome his own biggest fear in order to help his friend.