On the bloodmoon night, Catherine awakens her rare halfblood vampire power. She fakes amnesia and uncovers the betrayal of her fiancé Raven and adoptive sister Ilona, who turns out to be the surviving ShadowClan princess aiming to seize her power with forbidden magic. Together with Cassian, she foils plots and defeats the powerhungry high priest. She overthrows the old autocratic system, stays with Cassian, and ushers in a new era of coruling for the vampire clan.