Seventeen-year-old Wren Connolly died at age twelve, and one hundred seventy-eight minutes later, she came back—a Reboot, resurrected by the KDH virus that swept through the Republic of Texas and turned the dead into something faster, stronger, and nearly emotionless. The higher the number of minutes you were dead, the less human you remain, and Wren's 178 makes her the most dangerous and least feeling soldier in the HARC facility, a government compound where Reboots are trained to hunt down criminals and eliminate threats without question or mercy. But when Wren is assigned to train Callum 22, a new Reboot who died for only twenty-two minutes and still clings stubbornly to his humanity—his humor, his compassion, his ability to feel—everything she's been taught begins to crack open. Callum sees her not as a weapon but as a person, and for the first time since her death, Wren begins to remember what it means to be alive. As HARC's orders grow darker and the truth about the facility's real purpose comes to light, Wren must decide whether to remain the perfect soldier or risk everything to escape with the boy who made her want to feel again.