The Big Empty — J.B. Stephens

One year ago, a devastating plague called Strain 7 killed three quarters of the human race. Around the world, power systems failed and supply chains screeched to a halt. The surviving population of the United States has been relocated to the coasts; the heartland is now a wasteland called The Big Empty. But seven teens trying to put their lives back together will learn that the abandoned zone holds danger, secrets, and above all, hope.