Blood Island picks up right where Blood Oath leaves off. Elizabeth is on the run after her failed attack on Christopher and Bryon has basically become a prisoner at headquarters.
Christopher decides to send Raya and her friends to Haimos, a siren island with an ally colony. Of sirens and Haflings.
Raya is looking forward to staying on the island and being around her own kind. The water is pure, she's not the only one eating human food, and she's hoping to spend time with Drew. But she's haunted by nightmares that leave her afraid of sleeping and feeling towards Issac that she doesn't want to think about. Plus her island guide and fellow halfling Orian my have the secret to being as strong as a siren and she wants to know.
This is a great follow up to the first book. It's full of action and a quick read with just enough romance to be a focal point but not overshadowing everything else. There is not currently another book in the series, but it definitely ends on a cliffhanger like the previous book.