Under the Egg by Laura Marx Fitzgerald
Okay, I had this book checked out from the public library forever and had to return it. I admit, I almost returned it without reading it. But then I decided to crack it open (ha, ha).
I am SO glad that I took the time to read it (and incur the late charge).
I can only describe this book by using the publisher's words: This is From the Mixed Up Files of Mrs. Basil E. Frankwiler meets Chasing Vermeer.
And to that I would add "meets Monuments Men."
4th grade me would have ADORED this book. And grown-up me is kind of in love with it too.
Best for: grades 4-7.