Fifteen-year-old Cassie is the girl who lost it all. Her world ripped apart. Her mother and father dead. Her little brother captured. On a lonely stretch of highway, she runs from Them. The beings who only lookhuman, who roam the countryside killing anyone they see. Who have scattered Earth's last survivors. To stay alone is to stay alive, until she meets Evan Walker. Beguiling and mysterious, Evan may be Cassie's only hope for rescuing her brother--or saving herself. Now, she must choose: between trust and despair, between defiance and surrender, between life and death. To give up or to get up. Cassie Sullivan gets up. In multi-award winner Rick Yancey's gripping, epic young adult series, the most dangerous lie is the one that gives us hope.