John Simm is back as detective Roy Grace for a new season of gripping mystery stories, which kick-start tonight on ITV1 and ITVX.

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Grace is inspired by the popular novels by Peter James and follows the titular sleuth as he unravels disturbing cases around Brighton and Hove, with the season premiere concerning a violent robbery that leaves a woman seriously injured.

In an exclusive first look clip from the episode, we see Robert Glenister step into the role of antiques dealer Gavin Daly, whose sister is the victim of a vicious attack that could leave her with paraplegia.

His cold demeanour isn't surprising given such harrowing news, but will he step up to help the investigation or prove a hindrance in Grace's search for justice? Tune in tonight to find out.

The Grace cast, comprised of Richie Campbell, Zoë Tapper and Craig Parkinson, are back in action alongside Simm for this latest run, although one of them will be stepping away before season 5.

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Indeed, Line of Duty alum Parkinson confirmed the news via Instagram, explaining that he's had a "wonderful journey" on the crime drama, but that he won't be returning after the season 4 finale. What this means for his character remains to be seen.

For now, read on for everything you need to know about Grace season 4 on ITV1 and ITVX.

Grace season 4 release date: When does it start on ITV?

John Simm as DS Roy Grace, Richie Campbell as Branson and Zoe Tapper as Cleo Morrey in Grace, stood on the pier in Brighton
John Simm as DS Roy Grace, Richie Campbell as Branson and Zoe Tapper as Cleo Morrey in Grace. Tall Story Pictures for ITV and ITVX

After a slightly longer wait than last time, Grace season 4 will officially start tonight, Sunday 1st September, at 8pm on ITV1 and ITVX.

New episodes will continue to air each week on Sundays, until the fourth and final instalment has aired on 22nd September.

The new season started shooting in April 2023, and the show has already been renewed for a fifth season.

What will happen in Grace season 4?

John Simm as DS Roy Grace and Robert Glenister as Gavin Daly in Grace season 4 sitting on a garden bench and speaking.
John Simm as DS Roy Grace and Robert Glenister as Gavin Daly in Grace season 4. ITV

The fourth season of Grace will adapt the next four books in Peter James's Roy Grace series, with these being Dead Man's Time, Want You Dead, You Are Dead and Love You Dead.

The official synopsis for the first episode has been released, teasing: "A brutal robbery at a secluded Brighton house pulls Grace and Branson into a challenging enquiry when thousands of pounds' worth of beautiful antiques are stolen and the owner is left fighting for her life.

"The prime target, however, appears to have been an item of great sentimental value to the homeowner and her brother, a renowned antiques dealer.

"This particular item has deep emotional ties to a fascinating mystery involving their father which spans back to 1960s East London and a painful night on which their life as they knew it changed forever.

"The question is – who knew it was in the house? As Grace digs deeper into this mysterious crime, he unearths a web of ancient grudges.

"A web which leads him down a murderous trail through the world of Brighton antiques in a race against time to discover who is at the heart of this robbery, recover what was taken and bring to light answers which have been buried for many years."

Grace cast - who will be back for season 4?

John Simm as DS Roy Grace, Brad Morrison as DC Nick Nicholl, Craig Parkinson as DS Norman Potting, Laura Elphinstone as DS Bella Moy and Richie Campbell as Branson in Grace season 4 stood in suits looking into camera
Grace season 4. Tall Story Pictures for ITV and ITVX

The central cast from Grace season 3 will be back for the fourth outing, including John Simm, Richie Campbell, Craig Parkinson and Laura Elphinstone.

Zoë Tapper will also be back as Cleo Morey, after she revealed that she was pregnant with Roy's child at the end of season 3.

Not only that, but Clare Calbraith is also back as Roy's missing wife Sandy - who seems like she may have some news of her own, after she seemingly took some of Roy's hair for a paternity test.

Meanwhile, guest stars for this season include Robert Glenister and Laura Aikman.

Here's a full list of the central cast who are returning for Grace season 4:

  • John Simm as Roy Grace
  • Richie Campbell as Glenn Branson
  • Craig Parkinson as Norman Potting
  • Laura Elphinstone as Bella Moy
  • Zoë Tapper as Cleo Morey
  • Brad Morrison as Nick Nicholl
  • Sam Hoare as Cassian Pewe
  • Clare Calbraith as Sandy

Grace season 4 trailer

You can watch the trailer for Grace season 4, giving a sense of the mysteries Roy and the team will be investigating this time around, right here.

You can purchase the Peter James Roy Grace books which will be adapted for season 4, Dead Man’s Time, Want You Dead, You Are Dead and Love You Dead on Amazon now.

Grace season 4 will air on ITV1 and ITVX from 8pm on Sunday 1st September.

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Check out more of our Drama coverage or visit our TV Guide and Streaming Guide to find out what’s on. For more from the biggest stars in TV, listen to The Radio Times Podcast.

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