Sometimes it takes an alien to tell us humans how to live.

The Vonnadorians are advanced beings who come to our messy, wet planet and think we, The Humans, are inferior. They believe we are not ready for more technological progress so they eliminate Professor Andrew Martin, who has made a breakthrough in mathematics which would change the course of humanity’s future. Naturally, they replace him with an alien look-alike who is ill-prepared for his mission to erase any knowledge of the Cambridge professor’s work--and to destroy anyone who knows about it.

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!