In a terrifying world where an epidemic has killed most of the world's adults, fifteen-year-old Abby struggles to survive. When a deadly mutation of the original disease threatens her little sister, 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 out for her sister, but she soon learns that time is running out for everyone outside Colony East.