Life on Earth isn't always fair, so Sophia runs off to the moon, where there are no bedtimes, no time-outs, and no Mom.
But as Sophia and her mom send letters to each other, Mom has a clever comeback for all of Sophia's angry notes. Home starts to sound not-quite-so-bad, especially when Mom reports that someone from the moon has moved in to Sophia's old room, they're having spaghetti for dinner, and they're reading Sophia's favorite story...