In a terrifying new world, four girls must depend on each other if they want to survive.

Evelyn has always suspected that things are more sinister and more complicated than they seem. Now that Maddie has been kidnapped, Rosie, Louisa, and the boys are paying more attention to Evelyn's theories. As the group makes their way toward war-torn Chicago, they're under constant threat of capture. Danger and dark surprises lurk around every twist of the road.

Evelyn knows they need a solid plot to find Maddie. But what the group comes up with may be their riskiest plan yet: infiltrating the Alliance itself. Even Evelyn has her doubts. Can they save Maddie before it's too late?