Mr. Rabbit worries about getting 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.

"Meet Odder, the Queen of Play: Nobody has her moves. She doesn't just swim to the bottom, she dive-bombs. She doesn't just somersault, she triple-doughnuts. She doesn't just ride the waves, she makes them. Odder spends her days off the coast of central California, practicing her underwater acrobatics and spinning the quirky stories for which she's known. She's a fearless daredevil, curious to a fault. But when Odder comes face-to-face with a hungry...

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.

It is difficult for Murray, the younger sibling, because her older sister, Otti, always wants her own way, and takes whatever she wants--so Murray comes up with some basic rules to make play time more enjoyable for both of them.