Margot Robbie stars as Ann, daughter of the town preacher and perhaps one of few healthy survivors of a global nuclear apocalypse, living in seclusion awaiting the return of her father and younger brother in the only spot in the vicinity seemingly unaffected by the ravages of radiation, where crops can still yield good food. It's a great life, as lives go these days, but without someone to share it with, things are mightily lonely for a young farm girl. Soon enough, however, she is not alone anymore, when a radiation-poisoned Loomis enters the area from outside, looking for sustenance to stay alive. Loomis, an engineer by his former trade, stays on the farm until he can get back on his feet, eventually helping to fix many of the things that no longer work around the farm, and the two soon find a romantic bond, perhaps a necessary one if they are the human race's best chance for a positive future. But they aren't, as Caleb soon enters the scene, causing tension and jealousy in the middle of a burgeoning sustainable paradise.