This Is Not My Hat

Klassen, J. (2012). This is not my hat. Sommerville, MA: Candlewick Press. 

A small fish steals the hat a large fish. He thinks he will get away with it, so he swims to an area where there are large plants. On his way, he meets a crab and tells him not to tell anyone he had seen him. The big fish woke up and followed the small fish. The crab told him where he was hidden. The big fish goes to the tall plants and gets his hat. The reader is left wondering what happened to the small fish.

You can see an animated book trailer on the following link:

https://www.youtube.com/watch?v=6MuDfdxESOQ