Lincoln, the only boy in the Loud family, is diagnosed with a terminal disease. The doctors give him just a few weeks left at best. How will an eleven years old boy react when he finds out he'll die soon? And his sisters? Will they be able to hold on after the emotional core of the family is taken from them, or will they fall apart? Rated T for the feels... too sad for kids.

When Lincoln wins a free reservation at a resort, he of course invites all of his family to join him. But when said resort is standing next to a certain mountain, their visit up the mount might extend the Loud Siblings' trek by a little bit. What friendship and trials await them? Look out Underground, here come the Louds.