joel lives with sarah (his 12 years old daughter) in america. one night, sounds of explosions broke the silence. it seems that a kind of mushroom sick goes to the human body and changes their genetics and make them to "wild people eater". joel, his brother tommy, and sarah want to escape from the city but the city was surrounded by armed soldiers and in the middle of the way, sarah is shot by one of the soldiers and dies in her father's arms.