Heartbroken after Prince Domhnall refuses to propose, Princess Clía hatches a plan: follow him to Caisleán Cósta, a prestigious military academy with a brutal reputation, prove herself worthy and secure the betrothal. Simple enough. Warrior Ronan has no interest in distracting blonde princesses, yet finds himself intrigued by her fierce determination, even knowing she is his best friend's intended. As sparks fly between them, a very real war looms on the horizon, threatening their kingdoms and testing every heart involved.