The world has been destroyed by the Calamity virus, which has wiped out most of the population and left the survivors sterile. While searching for supplies, Lane encounters a young pregnant woman at the side of the road. Elsa is on the run from scientists who want to take her and her baby for research. Realizing she is in danger alone in the city, Lane takes Elsa home to her shelter beneath an abandoned factory.
Trapped together in a small room for weeks, the two experience an undeniable attraction to one another, but Lane has given up on life and any hope of finding love. Can Elsa and the impossible promise of new life give Lane the will to live again, or will Lane's secrets tear their tiny family apart before it's even complete?