After the death of her parents, Lee adopts her nieces Imogen and Maeve during a devastating pandemic and raises them in a remote cabin, far away from any civilization. In order to survive, the girls are raised to never leave the forest and avoid any interaction with strangers, while Lee acts as the only link to the deadly outside world. But when Imogen and Maeve discover an injured man near their cabin, they begin to question those rules - with devastating consequences...