Mr. Rabbit wonders if he will be able to get along with his new neighbors, who are otters, until he is reminded of the golden rule.

Oona and her best friend Otto love to search for treasure but often find messy, tricky, and even shark-related trouble, instead.

Otto is a young otter who can do many things well, but swimming is not one of them until his older sister tells him to start small and, little by little, he is able to reach his goal, adding swimming to his "I can do" list.