100 years in the future, when the Earth has been abandoned due to radioactivity, the last surviving humans live on an ark orbiting the planet — but the ark won't last forever. So the repressive regime picks 100 expendable juvenile delinquents to send down to Earth to see if the planet is still habitable.
Clarke and her friends attempt to rebuild Sanctum as a new threat rises in the woods
Echo and Gabriel learn more about Hope and her mysterious past
As Raven faces an unexpected threat, Clarke must keep the peace among opposing factions in Sanctum
Mysterious outsiders arrive with news of Clarke’s missing people