Mr. Mercedesbegins with a monstrous act of mass murder.

A warped soul wearing a clown mask mows down 16 people by driving a car through a crowd.

We get close-ups of people getting trampled.

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Credit: Jim Bridges/AT&T AUDIENCE Network

But what sticks with you isnt the horror, its the humanity.

Mercedeshas more on its mind than hit-and-run schlock shocks.

This prologue sums up the power and flaws of the 10-episode limited series from superproducer David E. Kelley.

The result isnt as transcendent asBig Little Lies, butMr.

Mercedessneaks up on you and makes an emotional impact.

Unless Kelley has made radical final-act changes to Kings plot,Mr.

Mercedesis a whydunit, not a whodunit, much like USAs thrillerThe Sinner.

Yeah, a few.

Theyve left him profoundly impotent and feeling powerless.

He was never caught.

And now, the high from that psychotic joyride has finally begun to fade.

Fixated on this cold case is retired cop Bill Hodges, a boozy man-bear played by Brendan Gleeson.

Bills equipment doesnt work like it used to.

Thats hard on a guy, you know.