Sure enough, the sea woman will come for what’s hers.

Ever since her mother’s death, Kela feels every bit as broken as the shards of glass, known as “mermaid’s tears,” that sparkle on the beaches of St. Rita. But when she discovers a different kind of treasure, she accidentally summons an actual mermaid—the wrathful Ophidia.

Ophidia makes Kela a bargain: her ancient comb, in exchange for a wish. And though Kela knows that what she wants most is her mother back, a wish that big will exact a dangerous price…