On the distant world of Kosos, Corvidal is trying their best to live a quiet life and stay out of trouble. As Kosos becomes more densely populated by humans, genderless Ursuans like Corvidal have become the target of racially motivated hate crimes and bullying. Now, as the human holy day of Christmas approaches, the time of peace that Cor had hoped for evaporates, and Cor is pulled into darkness by a cruel man named Carson, who is determined to rid his world of aliens.