Warriors: Cats of the Clans, by Erin Hunter, is an overview of the lives of the cats from the Warriors series, which is also by this author. With beautiful illustrations and short but fact-filled descriptions of the cats' lives, the book presents well-known cats from each of the clans (ThunderClan, RiverClan, ShadowClan, and WindClan).
This is a must-read for fans of the series, and a good introduction for new readers as well. It was very quick, and very enjoyable. I loved it!
This book was for the Support Your Local Library Challenge.