Poppy (Avi)

Poppy is a tiny little mouse with a huge heart of courage. Part of an enormous family of deer mice, Poppy has grown up heeding the survival lessons taught by her father. The most important rule is asking permission from a huge forest owl, Mr. Ocax, before leaving their home to go to another part of the forest. Mr. Ocax is the villain we love to hate. He is the ultimate bully, and continually takes advantage of the mice. Eventually, brave Poppy learns that even Mr. Ocax has fears. 

This is the best children's fiction book I've read in a long while. It is suspenseful, witty, and would make a great readaloud for any 3rd-5th grade class.