The series is set 97 years after a devastating nuclear war started by an Artificial intelligent System wiped out almost all life on Earth. Survivors from the nuclear apocalypse have broken into dangerous factions including The Grounders, Reapers and Mountain Men. In Season Two, Clarke and Monty have been captured by the Mountain Men and are being held inside Mt. Weather, but the fate of everyone else is unclear. While Clarke struggles to make sense of her bizarre surroundings, Lincoln risks his life to save Octavia, and Kane establishes his authority.