A working class high school drama department and the students come alive under a passionate teacher and family man whose dedication to the program galvanizes the entire town.
Based on Stephen King's 2014 book, Mr. Mercedes follows a demented killer who taunts a retired police detective 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 show follows the return of a local politician's young son, who was presumed dead after disappearing more than a decade earlier, sending shock waves throughout his tight-knit community. But as the mysterious young man is welcomed back into his community, the neighbor sitting in jail for his murder is released and the cop responsible is forced to re-examine what truly happened so many years ago.