In a siren-infested sea, Thomas is the last survivor on a sinking ship, the only sailor unaffected by the sirens' song. Before he meets his end, the god of the ocean agrees to save him in exchange for his help. She believes Thomas is the only person who can help her find a cure for the siren plague that has afflicted mermaids around the world.

On his journey, Thomas is thrust into the unfamiliar world of magic and discovers it is nothing like he believed it to be. The memory of his first love haunts him, and the infamy of his family name follows him. His comfortable reality slowly crumbles as he learns his family has been hiding a terrible secret.

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If Thomas doesn't find the courage to face forces much larger than himself, it could mean losing the chance to right his family's wrongs, or worse, letting the world fall to darkness.