The illustrations are really cute, but the story falls a bit flat.  As a bunch of kids set off to trick-or-treat, one of the little girls is startled to notice the moon is disappearing (behind some clouds).  Her big brother (?) declares that he, as Sorcerer of Space, is the only one who can save the moon.  Gretchen tags along as his sidekick and together they climb a ladder to the moon and discover that it is being eaten by jack-o-lanterns, from which they save it before returning to trick-or-treating. Not much of anything in the way of character development.