A mysterious virus wiped out half of the Earth's population. The survivors are forced to adapt to a post-apocalyptic world. Daily searches for food, shelter, and loved ones have become their primary responsibilities. Fate played a cruel joke on Abby Grant, an Englishwoman. Her body developed immunity to the virus, allowing her to survive. However, her husband died suddenly upon realizing he was infected. Now, she hopes to find her son Peter, who was separated from her by the epidemic.