Dayeon is learning to be haenyeo, a sea diver, from her grandmother. It's a tradition passed down among women on their South Korean island, but even though she and Grandma practice holding their breathing regularly, Dayeon hasn't felt ready to dive deep. Instead, she explores along the shore. But on this day, when Grandma comes in from a dive and asks Dayeon if she's ready to try, Dayeon finds her courage and says yes. She's still scared, but with Grandma's guidance and support she explores the ocean world farther out from shore, beneath the water's surface, looking for "treasures." When dolphins appear, meaning sharks may follow, Grandma leads her back up, into the arms of other haenyeo waiting on a boat. To be haenyo, Dayeon understands, is to be a treasure-seeker, a mermaid, and most of all part of a community. Gorgeous illustrations with intense watery hues are a captivating backdrop for wonderfully measured, delightfully detailed storytelling grounded in Dayeon's perspective. An informative authors' note tells more about the centuries-old tradition of haenyeo, which been named by UNESCO to the list of "Intangible Cultural Heritage of Humanity." (Ages 5-8)