Mr. Mercedes (2017)

Name: Mr. Mercedes
Genre: Mystery, Sci-Fi & Fantasy, Drama
Cast: Brendan Gleeson, Jharrel Jerome, Holland Taylor, Breeda Wool, Justine Lupe

Don’t let him inside your head.

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.