"Since her twin brother, Eddie, drowned five years ago, sixteen-year-old Elsie Main has tried to remember what really happened that fateful day on the beach. When cute, mysterious Tay introduces Elsie to the world of freediving, she vows to find the answers she seeks at the bottom of the sea." -- Provided by publisher.

After suffering a near-fatal freediving accident, seventeen-year-old Addie Spencer tags along on her mother's honeymoon to a private island where she unearths dark secrets--a child ghost, moody flowers, and a deep pool where no one feels pain--before realizing the island might not be willing to let her go.