Storm of Sharks (Wereworld Series #5) by Curtis Jobling

The epic Wereworld saga continues with fifth installment in this thrilling series!

Drew Ferran—werewolf, leader of people, and the rightful king of Lyssia—battles the evil Catlords who seek to oppress the kingdom. As the war’s scope widens, Drew and his allies take the fight to the high seas. But just as many terrors await them on the water as on land, with pirates and scoundrels abounding and a host of previously-unknown werelords emerging to take sides in the war that threatens to destroy the Seven Realms. 

"Game of Thrones for the tween set." —School Library Journal