Many people died when the end times came. Those who survived did so by building bubbles - protective domes that protected them from the radioactive ash beyond. Keeping one running takes a village. It's for this reason that everyone has their role to play. Except the Elders. Their only job is to remind the ones born after the End that life is about more than mere survival.

When their oldest resident decides she wants to celebrate something called "Christmas" for the last time, Caroline is baffled, but must agree. With the strange request, she'll learn more than the mechanics of an ancient holiday. She'll learn the true meaning of love and friendship.