Once upon a time, there was a boy who found himself on the moon one day and couldn't return home. However, he was not alone... What will the boy do, especially now that he suspects there is a creature lurking in the darkness waiting to eat him? Fortunately, he quickly realizes that the creature is friendly, so everything changes, and they can help each other to get back home. This is the fourth book in the series of the boy's adventures that began with How to Catch a Star and continued with Penguin Lost, Penguin Found, and Do Penguins Fly?