Six friends meet in an isolated mountain town in Northern Idaho to commemorate the fifth anniversary of a close friend's suicide. A week of hiking, spending time in nature, and bittersweet reunion soon takes a sinister turn as the friends find themselves fighting for their lives and struggling to survive.

A seemingly tranquil community bombarded by late spring storms becomes a trap filled with monsters and threats everywhere they turn. Terrifying secrets are revealed, and the survivors are left to wonder what will be left of the world outside if they can find a way to come through the gauntlet alive.