On a sunlit reef teeming with sea life, mermaids Coral, Filly, and Manta each lovingly tend the plants and animals around them. When Coral comes upon an empty hollow at the heart of the reef and tries to keep it as her very own, Filly and Manta are banished. All that grows in the wake of her anger is regret, and in this tale for readers 4 to 7, Coral must find a way to make amends—but she can't do it alone. The artist behind the Caldecott Honor book Flora and the Flamingo creates an undersea world of luminous pastel tints.