The first season focused on Brady Hartsfield, a demented killer who taunts a retired police detective Bill Hodges with a series of lurid letters and emails, forcing the ex-cop to undertake a private, and potentially felonious, crusade to bring the killer to justice before he is able to strike again. The second season picks up a year after the events of season 1, with Brady Hartsfield now hospitalised in a vegetative state. Now retired, Bill Hodges has done his best to move on from his obsession with Brady, teaming up with Holly Gibney to open Finders Keepers, a private investigative agency. But wen unexplainable occurrences begin to affect hospital staff members attending to Brady, Hodges is haunted by the feeling that Brady is somehow responsible.
Mr. Mercedes stars Brendan Gleeson, Harry Treadaway, Jharrel Jerome, Scott Lawrence, Breeda Wool, Justine Lupe, Holland Taylor and joining them this season are Jack Huston, Maximiliano Hernandez, Tessa Ferrer and Virginia Kull.