Marble Hall Murders: PBS Sets Premiere Date for Final Susan Ryeland Mystery

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Last Updated on April 22, 2026 by Stefanie Hutson

Marble Hall Murders is headed to MASTERPIECE on PBS, bringing Anthony Horowitz’s Susan Ryeland trilogy to its final chapter. Lesley Manville and Tim McMullan are both back, and the new six-episode run once again folds a “real” mystery into the fictional world of Atticus Pünd.

What is Marble Hall Murders about?

For anyone new to this corner of Horowitz’s work, the Susan Ryeland stories began with Magpie Murders and continued with Moonflower Murders, blending publishing-world intrigue with classic Golden Age-style detective fiction. Marble Hall Murders is the third and final installment, and it returns to the same dual-layer structure that made the earlier adaptations distinctive.

This time, editor Susan Ryeland is hired to work on a continuation novel in the Atticus Pünd series, written by a troubled young author. As the assignment pulls her into another real-life murder case, Susan unexpectedly becomes a suspect herself. Inside the world of the novel, Atticus Pünd travels to Corfu, where he investigates the murder of Lady Margaret Chalfont.

Who’s in the cast?

Lesley Manville (Phantom Thread, The Crown) returns as Susan Ryeland, with Tim McMullan (Fackham Hall, Patrick Melrose) back as Atticus Pünd. As with the earlier adaptations, several cast members play dual roles across the contemporary mystery and the 1950s novel-within-the-story.

The wider cast includes Jamie Blackley (If I Stay, The Last Kingdom), Mark Bonnar (Ludwig, Guilt, Dept. Q), Daniel Cerqueira (Down Cemetery Road, A Gentleman in Moscow), Patricia Hodge (All Creatures Great and Small, A Very English Scandal), Harry Lloyd (Wolf Hall, Game of Thrones), Rupert Penry-Jones (Whitechapel, Spooks), Anneika Rose (Crossfire, Line of Duty), Danny Sapani (Killing Eve, Harlots, Halo), and Zubin Varla (Andor, A Little Life). First-look images show Bonnar and Hodge among the most prominent guest stars in the new season.

Behind the scenes

Like the two earlier Susan Ryeland dramas, Marble Hall Murders is based on an Anthony Horowitz novel. Horowitz has described the project as the third and final installment of the TV series and suggested it may be the strongest of the three. Executive producer Jill Green has likewise framed it as the trilogy’s conclusion.

Production took place in Dublin, Corfu, and London, which fits the story’s split between Susan’s modern investigation and Atticus Pünd’s Mediterranean case inside the fictional novel.

Source Material

If you haven't already had the pleasure of reading Horowitz's novels, you can find them below:

• Magpie Murders – Editor Susan Ryeland discovers that the final pages of Alan Conway’s latest Atticus Pünd mystery are missing, and her search for them leads her into a real murder case connected to the author himself.
• Moonflower Murders – Susan is drawn into the disappearance of a young woman when clues suggest that an old Atticus Pünd novel may secretly contain the answer to a murder that was never truly solved.
• Marble Hall Murders – While editing a continuation novel in the Atticus Pünd series, Susan finds herself pulled into yet another real-life murder investigation, while inside the book Atticus travels to Corfu to look into the killing of Lady Margaret Chalfont.

Of course, if you're in the market for a hard copy, I highly recommend ordering from the UK instead of the US. The covers they made for that market are MUCH more attractive. You can order from Amazon UK HERE as an American or Canadian.

If you're curious about what's in store for Marble Hall Murders, or you'd li4ke to learn more about creator Anthony Horowitz's process, we recommend watching this interview he did for Barnes & Noble last year:

When and where to watch

For U.S. viewers, Marble Hall Murders premieres Sunday, September 6, 2026, at 9/8c on MASTERPIECE on PBS. The six episodes will air weekly through October 11, and full episodes will stream in the U.S. for 14 days beginning at 9 p.m. ET on each broadcast night.

In the UK, the series will air on BBC One and BBC iPlayer later in 2026, although a specific BBC premiere date has not yet been announced. If readers want to catch up first, PBS is also pointing viewers toward Magpie Murders and Moonflower Murders ahead of the new season.