A couple on the verge of divorce are given a new lease on love when they set out to renovate a historic hotel and their two children uncover a secret collection of letters written by a couple who never met. As Christmas day approaches, their teenage son and daughter scheme to recreate a similar romantic exchange between their own parents in an effort rekindle the warmth and affection they once felt for one another.
Cartman's deeply disturbing dreams portend the end of the life he knows and loves. Meanwhile, the adults in South Park are wrestling with their own life decisions, as the advent of AI is turning their world upside down.