In a terrifying world where an epidemic has killed off most of the world's adults, fifteen-year-old Abby struggles to keep her brother and sister safe. When a new, deadly disease spreads among the survivors, Abby must make the dangerous journey to Colony East, an enclave of hidden scientists caring for a small group of children for reasons unknown. Abby fears that time is running short for the victims, but she's soon to learn that time is running out for everyone outside Colony East.