You know when people describe a book as, "I couldn't put it down." Well, I literally could not put this down! I had no intention of finishing Mrs. Frisby and the Rats of NIMH in one day, but I did, and I don't regret it at all! This book was so engrossing, there was never a dull moment! I loved the characters and how everything unfolds. As it is a children's book, I didn't expect it to be so thought provoking, but there is an underlying theme of humans relationship with animals that brings up some interesting points of view without ever being too preachy. Obviously I loved this book, I highly recommend reading it if you haven't already no matter what age you are!