Devon arrives at Thunder Mountain and Jeremiah is looking forward to spending time with him, but finds their reunion being haunted by the unspoken question: what happened to Jeremiah's mother? Libby knows and gives Jeremiah a letter Devon entrusted to her long ago. As he reads, Jeremiah learns a lot about his parents and what happened to them right after the Big Death. What he does with the knowledge will shape his relationship with Devon for the rest of their lives.

Being at Thunder Mountain gives Theo time to ponder a question of her own: can she really handle the responsibilities that are looming in her new life? It falls to Erin to try help the woman who never accepts help from anyone.