Twelve-year-old Kira loves to swim. But her parents, who adopted her as a baby, have forbidden her to go near the sea where they live on the north Atlantic coast. Frustrated by their rules, Kira decides to rebel and jumps into the icy waters. She is shocked by what she learns about herself. With the help of her friend Cody, Kira begins the search for her original family. She soon discovers why her adoptive parents were afraid to let her go into the sea.