When Noel's current lord invites King Edward and his son, Prince Mark, to his kingdom for a three-day tournament, Noel realizes his days of living as a free water siren are rapidly coming to a close. After all, everyone knows all water sirens belong to King Edward, who is determined to make sure they never try to take over the human kingdom again. But Noel can't remember a time his peaceful kind ever tried. Resigning himself to a life of being an esteemed prisoner and pet isn't the end of the world, but Prince Mark is known to be just as cruel as his father.

To make matters worse, Prince Henry is everything Prince Mark is not — charming, kind, and considerate. Noel remembers Prince Henry from years before, though he has vowed to keep his love a secret. But with a three-day tournament and endless banquets throwing them together, just how long can Noel keep his love to himself? Three days is nothing... and yet it will have to be everything.