When beloved local author John Rothstein is found murdered, Hodges, Holly, and Jerome, along with local police, must track down his killer. But this case is more complex than the cold-blooded killing of an American icon.

Unpublished novels of Rothstein’s were stolen from his home, and they are worth millions. As the case unfolds, the trio learns that although Brady may be gone, his depravity lives on in the lives of his victims.

The New cast members Kate Mulgrew (Orange Is The New Black), Brett Gelman (Stranger Things) and Natalie Paul (You) are all aboard season 3!

Via Flickering Myth, Mulgrew will star as Alma Lane, a “life-long resident of Bridgton, Ohio and a compelling force in Morris’ life since he was a boy. She is a bit vicious and a lot smart”, Gelman as Roland Finklestein, a “smart, passionate defense attorney who is representing Lou Linklatter in her murder trial.

He believes he can win the case if they go to trial and keep Lou out of prison” and Paul will be A.D.A. Sarah Pace “At first glance one might think her soft, but she is a hardcore prosecutor with a strong moral compass. She doesn’t support or believe in Lou’s vigilantism and refuses to back down from pursuing justice.”

While one might deduce that season 3 (presumably covering the third and final book,) would mark the end of the series, creator/showrunner David E. Kelley teased a “master plan” with THR – ahead of the season 1 launch – that, "Going into this, the idea is that we have three books and in success it would make for three seasons and then, who knows? Maybe longer if we're having fun."

The mythology of Mr. Mercedes focuses on retired police detective Bill Hodges (Brendan Gleeson), who finds himself in the center of a circuitous psychological game involving the psychopathic serial killer, Brady Hartsfield (Harry Treadaway), whose initial criminal claim to fame involved plowing a Mercedes into a line of job seekers; a crime that earned him the story’s eponymous nickname, “Mr. Mercedes.” – The cast also consists of Jack Huston, Jharrel Jerome, Holland Taylor, Brenda Wool, Robert Stanton, Justine Lupe, Scott Lawrence and Tessa Ferrer.

As Daniel York, Senior Exec VP and Chief Content Officer at AT&T (which oversees Audience Network under the Turner Broadcasting corporate umbrella), expresses in a statement:

"Mr. Mercedes has resonated with such a wide audience, so we’re thrilled to bring it back for a third season for our customers,” said “David E. Kelley, Jack Bender and Sonar have crafted a series that honours the original work by Stephen King and we can’t wait to see where they take the show in a ‘post-Mr. Mercedes world."

The Mr. Mercedes TV series was created by prolific legal drama visionary David E. Kelley, who is confirmed to resume his duties as showrunner for season 3 along with director Jack Bender. The duo also serve as executive producers, joined in that capacity by Temple Hill Entertainment's Marty Bowen and Wyck Godfrey, Tom Lesinski and Jenna Santoianni of Sonar and AT&T Audience Network's Shane Elrod and Kate Regan. Most notably, Stephen King himself will remain a credited executive producer on the series.

Mr. Mercedes season 3 release date, Mr. Mercedes season 3 will get underway on 10th September in the US, and consists of 10 episodes. Amazon Video's STARZPLAY has yet to announce a UK release date for season 3.