In a world where the ocean remembers every soul it steals, Zacarias "Zara" McClaire stands as the only living survivor ever spared by the sirens-ancient, beguiling predators whose songs drag entire crews to their graves. Haunted by fragmented memories of a lost childhood, a vanished island, and eyes watching her from beneath the waves, Zara finds herself trapped aboard a doomed fishing vessel as the sea begins to sing again. With sailors disappearing one by one and something in the deep calling her by name, she must confront the truth long buried in salt and blood: the sirens did not let her go... they marked her. And now, the ocean has come to collect its debt.