Sidney investigates a strange skin disease that her homeless patient has. Turner discovers that it's got something to do with an experimental skin grafting technique. Someone tries to kill Sydney over this. Mysterious ally helps her.
When a brilliant pianist suffers a seizure during concert and dies, an implant that serves as a form of a steroid is found in his brain. Several other corpses with implants show up. Turner investigates who's killing these people and why.
A series of deadly road rage incidents makes Turner suspect that some kind of toxin is causing these fits of murderous rage. A Chinese immigrant who works at the gas station that everyone frequented may have something to do with it.
Turner is sent to a small town in Iowa to handle some paperwork involving a man killed by a gas leak. He finds signs of a more serious contamination there that may be tied to a GMO strain of potato. The man's son blames the town's elders.
Turner investigates the sudden appearance of a boy genius kidnapped six years ago, whose DNA is somehow more evolved than human DNA. Turner's illness returns and his time is up. Sidney gets betrayed by her informer.