How do you trust an adversary who's your only hope? After eighteen months of war, Lena's Emperor asks her to stand as hostage to a truce. Sent north of the Wall to live among people who were the enemy only days before, Lena learns the secret reason behind their invasion of her land - and challenging their leader over it may prove to be her worst decision yet. Far more than the success of a truce is now in Lena's hands, but in a place she neither knows...