This is a fun gender-switched Little Mermaid retelling. I enjoyed Kaerius/Kai and his journey of discovery, coming to the human world and learning that what he felt before was infatuation, while what he develops for Princess Marin develops into love. I also really enjoyed the politics in the human world and the difficulties she faces with her country in danger of invasion. I liked how Kaerius supports her and tries to help, even when his understanding is limited because the human world works so differently from the Mer world.
I liked the author's small details in comparing sea life to land life. There were some really fun moments with Kaerius discovering the differences and exploring the newness of it all. I also loved how Kaerius learned about humility and that it's not demeaning, but actually a strength. It was a lovely touch to a sweet story.
The ending was a little rushed for my tastes and the resolution too easy. I think if there'd been more time pressure for Kaerius to accomplish his end of the deal it might have made the whole thing more intense, because he essentially achieves the goal in a quarter of the given time, so I never had any doubt he'd do it. Then again, Kaerius himself never doubted either, as he's that arrogant. But he's lovely in his arrogance.
Definitely a worthy contribution to this series and an interesting retelling.
Gender swapped Little Mermaid retelling with an arrogant ? Sounds awesome :) great review as always!