When Ruby is entrusted with an explosive secret, she must embark on her most dangerous mission yet: leaving the Children's League behind. Crucial information about the disease that killed most of America's childrenï¿1/2and turned Ruby and the others who lived into feared and hated outcastsï¿1/2has survived every attempt to destroy it. But the truth is only saved in one place: a flashdrive in the hands of Liam Stewart, the boy Ruby once believed was her futureï¿1/2and who now wouldnï¿1/2t recognize her.

As Ruby sets out across a desperate, lawless country to find Liamï¿1/2and answers about the catastrophe that has ripped both her life and America apartï¿1/2she is torn between old friends and the promise she made to serve the League. Ruby will do anything to protect the people she loves. But what if winning the war means losing herself?