Mr. Postmouse's Rounds
I've got it bad for books about mail and mail carriers. The thing is, though, that I already have such strong favorites (The Jolly Postman and The Mighty Lalouche) that any new book about a postman is met with some skepticism.
However, Mr. Postmouse's Rounds by Marianne Dubuc is a visual joy. As Mr. Postmouse makes his way through a neighborhood full of creatures great and small, we see cross-section illustrations of each creature's home, ingeniously crafted for their own unique needs. And Dubuc's renderings of these dwellings are spectacularly brilliant -- clever, hilarious, and full of surprises.
In this very niche category of mail carrier fiction, Mr. Postmouse's Rounds totally delivers.