Fiction by Julie Otsuka.
I read this a while ago, but it's probably one of my favorites. It really made an impression.
It's about Japanese iternment camps during World War II, which was not an issue I'd been aware of before reading it.
I definitely recommend this book.
This book came out way back in 2002, and the author is just now releasing her second book. I can't wait to read that one too.