Born with the immortal power of wind and ice, Fae princess Calanthe Ashryver Whitethorn Galathynius is the daughter of the firebringer herself. As Calanthe and her twin brother Eroan go about their lives, they are surprised by the birth of their baby sister, Lenore. One night, as a strange darkness steals the happiness from a grand celebration, Calanthe is faced with an impossible choice that will irrevocably change everyone's lives: for the worse, it is yet to be seen. Set in the world of Sarah J Maas's "Throne of Glass", "Oath of Blood and Ice" takes place over a century after the final war with the Valg.