In this fast-paced debut, a 17-year-old girl rises from the dead and is trained as an elite crime-fighting soldier. Wren is one of the young people who, after dying of a widespread virus, came back to life. Called Reboots, they are strong, fast and able to heal. Wren becomes the most feared and formidable Reboot in the Republic of Texas and she and others must capture and kill civilians in the name of state security. She is assigned to instruct Callum, 22, who is practically human and the worst trainee Wren has ever had. But she finds herself falling for him and after Wren is told to eliminate Callum, she does whatever it takes to save his life.