In room 217 of the traumatic brain injury clinic, something awakened. Something Evil. Brady Hartsfield, Mr. Mercedes, the perpetrator of the community center massacre, who killed eight innocent people and severely injured many others, lay as a vegetable in a traumatic brain injury clinic for five years. The doctors had absolutely no faith in his recovery. But after all these years of blank staring and dripping drool, Brady finally returned to consciousness, so that, without leaving the room, he could cause terror and chaos with his newfound abilities. Retired police officer Bill Hodges, the hero of the story with Mr. Mercedes and Finders Keepers, is now involved in private investigations together with his partner, Holly Gibney, who dealt Brady that fatal blow to the head. Then Mr. Mercedes threatened not only Bill and Holly with death, but also their friend Jerome, his little sister, as well as thousands of spectators at the concert. But Brady is back, and his plans include more than just revenge on his offenders. He wants revenge on the entire city. "End of Watch" by Stephen King concludes the detective trilogy about Bill Hodges with the writer's calling card - supernatural horror of the unknown, an unusual look at the vulnerability of man and his nightly amusements.