Penelope Rex is a very brave dinosaur, but she has one giant fear. She is absolutely terrified of Walter, the class goldfish. When her teacher announces that every student will take a turn bringing Walter home for the weekend, Penelope's anxious imagination goes into overdrive. She is sure the fish is ominously licking his lips at her. The weekend gets off to a very bumpy start, complete with a sleepless night where Walter's bowl seems to creep closer and closer to her bed. But the real panic begins when Walter suddenly goes missing. Now, Penelope must dig deep and face her biggest, fishiest fear to find her aquatic classmate. Along the way, she might just discover that there is a lot more to Walter than his chomping jaws. This hilarious and heartwarming story perfectly captures the wild worries of childhood and the courage it takes to overcome them.