Joe (Nick Robinson) is sick of putting up with the moods of his distant, widowed father (Nick Offerman). Meanwhile, Joe’s best friend Patrick (Gabriel Basso) is being driven round the bend by his own doting parents, the Keenans (Megan Mullally and Marc Evan Jackson). The two teenagers make a pact: they’ll run away and build their own house deep in the woods, make their own rules, and live their own lives. Somehow, diminutive oddball Biaggio (Moises Arias) ends up tagging along with them.
For a while, everything seems perfect as the three boys enjoy their freedom – though their attempts to live off the land leave something to be desired. But then Joe invites Kelly (Erin Moriarty), the girl with whom he’s infatuated, into their secret idyll, and there’s trouble in paradise.