"20 years after the outbreak of a fungal epidemic that ravages the United States, some of humanity's last remaining occupy a quarantine zone in Boston. Martial law dictates that any man, woman, or child stupid enough to step out of line or venture outside the camp will be shot on sight. So it is that 14-year-old Ellie knows nothing of the world outside these concrete walls. The Infected ravage the streets outside, hungrily searching for hosts to accept the fungus that will attack their brains and engulf their minds. Ellie knows nothing of their terrors, but she will soon find out."