After the first wave, only darkness remains. After the second, only the lucky escape. After the third, only the unlucky survive. And after the fourth wave, only one rule applies: Trust no one. Now it's the dawn of the fifth wave, and on a lonely stretch of highway, Cassie runs from Them. The beings who only look human, who roam the countryside killing anyone they see. Who have scattered the earth's last survivors. To stay alone is to stay alive, Cassie believes, until she meets Evan Walker. Beguiling and mysterious, Evan may be Cassie's only hope for rescuing her brother, or even saving herself. But Cassie must choose: between trust and despair, between defiance and surrender, between life and death.