I'm Not Clara

When Rosa Hart is captured in her last fight on the tides, she is sentenced to hanging until a Lord named Alexander Hunt mistakes her for his late fiancé, Clara Stone. He takes her home with him and she quickly accustoms to the life of a 'land-lubber', for she never really belonged to the waves like her father did. She grows to know more about her unbiological twin, and unknowingly becomes more like her every day.