Princess Caolainn of the Summer Court has her entire future planned out for her: assume the throne, marry the man her father selects, and produce an heir. A life that promises more isolation inside the stone walls of her castle and none of the passion she yearns for. When the King does an about-face and approves her request to travel to the human realm, Caolainn is granted a few short months to taste freedom and live the life she's only ever dreamed about. But when an ancient enemy threatens both realms, will Caolainn choose the life planned for her or the one written in her heart?