If the Summer King doesn't save Summer, humanity will perish with it, but the Dark King has discovered that he asked to forget why the not-entirely-mortal Moira Foy matters to his court, so he endeavours to prevent the Summer King from finding the mortal who would be Summer Queen. The Summer King has spent eternity romancing mortals, stealing their mortality as he seeks his missing Summer Queen. When he met Donia half a century ago, he knew that she would either break his heart or heal it. But Donia failed the test to be his destined queen, and Keenan has lost more than his missing sunlight this time. With the Winter Queen growing stronger every day and centuries of failure, Keenan is ready to quit trying.