Like a lost puppy, the moon follows a family home one night. Soon an entire town is affected by the celestial visitor. They all have just received their first Moonday.
At first, it is very exciting. When the moon shrinks enough to fit in the backyard, our protagonist hops onto it and explores. But things grow peculiar. Morning never arrives and everyone is feeling extra sleepy. Soon the backyard is flooded with a high tide and howling dogs!