A girl searches for a killer on an island where deadly sirens lurk just beneath the waves in this gripping, atmospheric debut novel.

The sea holds many secrets.

Moira Alexander has always been fascinated by the deadly sirens who lurk along the shores of her island town. Even though their haunting songs can lure anyone to a swift and watery grave, she gets as close to them as she can, playing her violin on the edge of the enchanted sea. When a young boy is found dead on the beach, the islanders assume that he's one of the sirens’ victims. Moira isn’t so sure.

Certain that someone has framed the boy’s death as a siren attack, Moira convinces her childhood friend, the lighthouse keeper Jude Osric, to help her find the real killer, rekindling their friendship in the process. With townspeople itching to hunt the sirens down, and their own secrets threatening to unravel their fragile new alliance, Moira and Jude must race against time to stop the killer before it’s too late—for humans and sirens alike.