This is a delicious third in the series, with the heroine, Ondine (formerly known as Lara), taking on the shark king, Sullivan, as her partner to face Challenge.
Disclaimer: I'm personally acquainted with the author.
Ondine and Sullivan make a terrific couple, and I love the tie-in the Haitian gods and goddesses, as well as Ondine's Demonos opponent, the Iku-Turso (a Finnish sea monster, think Ursula from the Little Mermaid on steroids.) There is a blending of all kinds of god and goddess legends in all these novels., which I very much enjoy, and I am delighted there are going to be a couple more novels in this world. The world building is excellent, each book works as a standalone, and the romance is suitably steamy. Recommend.