Book excerpt: In a terrifying future world, four girls must depend on each other if they want to survive.Maddie is ready for action. Louisa, Evelyn, and Rosie helped rescue her from the Alliance's grasp, and she's learned an enormous, game-changing secret: her mother is the leader of the Resistance!But reuniting with her long-absent mother is not going to be easy. As Maddie and her friends set out to find the Resistance headquarters, they are relentlessly pursued by the Alliance. Worst of all, members of their group have gone missing in the middle of rubble-strewn Chicago.Maddie and her friends have earned their battle scars, courage, and strength. But at this darkest hour, will they be able to make it back to their families . . . and freedom?