Life on land is suffocating for Jess Creary, who wastes her summers flipping burgers for tourists on a fishing boat off her quaint resort island home off the coast of Maine. After all, her older sister Kay died in a boating accident two years ago, her mother has disappeared, and her father isn't exactly dealing with things so well. Surfing and the handsome Captain Matthew are about the only bright spots in her life. Then, on her twenty-third birthday, Jess catches the perfect wave--a wave that transforms her into a mermaid. Under the sea, a startlingly beautiful, dark place, Jess is reborn into a confident, powerful predator with superhuman strength --finally she is someone to be reckoned with. Meanwhile, back on land, Jess's relationship with Captain Matthew heats up, and so does her search for justice for Kay. Jess has thirty days to choose between land and sea; legs and fins; her humanity and her freedom. Who could ignore the freedom of the sea? Yet, the ocean is a dark, wild, lonely place. Is this a gift or a curse? Will Jess choose family and love, forgiveness and truth, or will she be seduced by the wild call of the sparkling sea forever?