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You can stream Mr. Mercedes (2017) on Peacock with a subscription.

A demented serial killer 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 can strike again.

A retired detective finds himself trapped in a psychological cat-and-mouse game with a killer who communicates through taunting digital messages. This hunt forces an aging lawman to bypass the rules and risk everything to stop a spree before the next victim falls.