“Mr. Mercedes” picks up a year after Brady Hartsfield’s thwarted attempt to perpetrate a second mass murder in the community of Bridgton, Ohio. Since the incident, Hartsfield has been hospitalized in a vegetative state. Retired Detective Bill Hodges has done his best to move on from his Brady obsession, teaming up with Holly Gibney to open Finders Keepers, a private investigative agency. But when unexplainable occurrences begin to affect hospital staff members attending to Brady, Hodges is haunted by the feeling that Brady is somehow responsible.
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