Following the death of their parents, Lee adopts her nieces, Imogen and Maeve, and raises them in a remote cabin as a deadly pandemic rages on around them. For over 10 years, the girls are raised to never leave the woods, avoid any and all interaction with outsiders, and ultimately rely on Lee as their only connection to the outside world. Lee has convinced the girls this is the key to survival in what is now an infectious and violent world. But when Imogen and Maeve discover an injured man in the nearby woods, Lee's absolute control begins to disintegrate as their faith in her, and everything they've ever known, begins to unravel.