Pi in the Sky by Wendy Mass
My rating: 3 of 5 stars
Joss lives in The Realms, seventh son of the Supreme Overlord of the Universe. His job? Deliver pies (except they're not really pies, they're encoded with stuff necessary for the birth and sustenance of planets and solar systems) and go to school. One day, someone on Earth actually sees The Realms, which draws the penalty of the entire solar system being removed from space/time... the entire solar system with the exception of Annika, a human girl. Now Joss is in charge of recreating the whole thing and restoring it to the point where Annika sees The Realms.
There's a lot here for middle grade readers to think about: what happens after death. what else might be Out There. what the universe is made of (and how it all works). The humor will also appeal, as will Joss' problem of being the youngest, sixth smartest kid in the family, not to mention still being in school despite being a few billion years old. Not fair, is it?
ARC provided by publisher.