Being a classroom hamster means having to be ready for anything?but suddenly there are a lot of big surprises in Humphrey?s world. Some are exciting, like seeing the playground during a fire drill and getting to roll around in a hamster ball. But some arent so good, like a cat creeping around, a different janitor who might be from another planet, and the most shocking thi Being a classroom hamster means having to be ready for anything?but suddenly there are a lot of big surprises in Humphrey?s world. Some are exciting, like seeing the playground during a fire drill and getting to roll around in a hamster ball. But some arent so good, like a cat creeping around, a different janitor who might be from another planet, and the most shocking thing of all?the possibility of Mrs. Brisbane retiring.Even with all that?s going on, Humphrey makes time to help a few classmates with their problems. But could Mrs. Brisbane leaving school be one problem that?s just too big for this little guy to solve?