In the new world led by the Rebooters, former Proxy Syd is the figurehead of the Revolution, beloved by some and hated by others. Liam, a 17-year-old Rebooter, is Syd's bodyguard and must protect him with his life. But armed Machinists aren't the only danger. People are falling ill; their veins show through their skin, they find it hard to speak, and sores erupt all over their bodies. Guardians, the violent enforcers of the old system, are hit first, and the government does nothing to help. The old elites fall next, and in the face of an indifferent government, Syd decides it's up to him to find a cure...and what he discovers leaves him stunned.