McCarthy mainstay Mark seeks out a rare local treasure to welcome home old timer Tim; at long last Neil opens the Mother Lode mine to the public for tourism, but his partnership with Jeremy puts the Keller family's future in the town at a crossroads.

Jeremy and his sons search the frozen wilderness for a lost bulldozer to sustain his family farmstead; Mark sets out to show his new fiancée the beauty of McCarthy, but finds danger; Neil makes a last-ditch attempt to save his dream.

When Jeremy crosses a frozen river in a two-ton bulldozer, he finds himself on thin ice; Jenny takes on a dangerous survival mission with her newborn baby in tow; Neil's business partner returns to town with big news.