The diabolical "Mercedes Killer" drives his enemies to suicide, and if Bill Hodges and Holly Gibney don't figure out a way to stop him, they'll be victims themselves. In Room 217 of the Lakes Region Traumatic Brain Injury Clinic, something has awakened. Something evil. Brady Hartsfield, perpetrator of the Mercedes Massacre, where eight people were killed and many more were badly injured, has been in the clinic for five years, in a vegetative state. According to his doctors, anything approaching a complete recovery is unlikely. But behind the drool and stare, Brady is awake, and in possession of deadly new powers that allow him to wreak unimaginable havoc without ever leaving his hospital room.