War is brewing between the Greenlands and the Summer Kingdom, despite the efforts of Lord Aidan and Prince Varion, who have been meeting in secret in an attempt to maintain peace. When war proves inevitable, Aidan offers Varion asylum, loathe to see the man he's come to care about become his enemy.

But Varion refuses, sacrificing safety and his own desires to stay in the Summer Kingdom in order to protect his little brother from their ruthless father. The two men instead declare a blood oath to always protect each other, an oath that will see them through war, transformation, and a deadly curse...