"A heroic little mouse leads three mischievous black cats on a wild and epic chase up and down and over and around and into the pantry as part of a plan to protect her best friend, a goldfish the cats have been frightening"--
When Penelope Rex brings home Walter, the class goldfish, for the weekend, she is not sure how to feel, but when Walter goes missing, Penelope searches high and low for her fishy classmate.