Ren Yu is a swimmer. Her daily life starts and ends with the pool. Her teammates are her only friends. Her coach, her guiding light. If she swims well enough, she will be scouted, get a scholarship, go to a good school. Her parents will love her. Her coach will be kind to her. She will have a good life. But these are human concerns. These are the concerns of those confined to land, those with legs. Ren grew up on stories of creatures of the deep, of the oceans and the rivers. Ones that called sailors to their doom. Ones that dragged them down and drowned them. Ones that feasted on their flesh. Ones of the creature that she's always longed to become: mermaid.