Is there another Susan Ryeland series?

Marble Hall Murders concludes the Susan Ryeland television trilogy, but Anthony Horowitz has spoken about writing another Susan novel. If you have just finished the series, that distinction matters: there is a possible next chapter on the page, while the television story has reached its intended end. Horowitz discusses the future with PBS (checked 19 October 2026).

Last checked: 19 October 2026. This guide keeps the endings hidden. For the story's final answers, open the separately labelled spoilers in our Marble Hall finale guide.

Is Marble Hall Murders the last television series?

Yes: PBS describes it as the third and final instalment, following Magpie Murders and Moonflower Murders. Lesley Manville returns as Susan, with Tim McMullan as Atticus Pünd. The final series again brings a contemporary investigation together with a mystery inside the book Susan is editing. You can watch the trilogy in that order, rather than trying to treat the three titles as unrelated programmes. PBS programme page (checked 19 October 2026).

Horowitz's own September news announcement also calls Marble Hall the final instalment. It announced all six episodes for BBC iPlayer from 26 September 2026, alongside the start of the BBC One run. That is a television conclusion, so a reader wondering about another novel is asking a slightly different question. Anthony Horowitz's BBC announcement (checked 19 October 2026).

What has Horowitz said about a fourth book?

In his PBS interview, Horowitz says he has another Susan Ryeland book in mind, called Merlin Murders. He intends to write it in about two or three years, while doubting that it will be filmed. His comments give readers something to look forward to, but they do not supply a publication date. It would be premature to put a release month, cover or television cast beside that title.

He also explains that completing the final television scripts helped him recognise that the screen trilogy had reached its end. For now, enjoy that conclusion as a conclusion; a possible future book need not take anything away from it. Watch Horowitz's interview (checked 19 October 2026).

Read Susan's three existing novels

The author's current book list includes Magpie Murders, Moonflower Murders and Marble Hall Murders. Our reading-order guide is the simplest next step if you came to Susan through television. Start with Magpie and move forward, giving the relationships room to develop alongside the individual cases. Choose the print book if you like turning back to a clue; choose an audiobook if you prefer hearing the story unfold. Anthony Horowitz's book list (checked 19 October 2026).

Reading after watching can still be enjoyable: you can focus on how the mystery is told without racing the detective to every answer. Keep our book-comparison sections closed until you are ready to discuss differences. The book links below let you choose your format without opening an ending explanation first.

If you are buying for somebody else, ask which of the three stories they have already read. A familiar television title does not necessarily mean they own the novel. Check the format and narrator on the retailer's page before choosing an audiobook, particularly when several editions appear together.

Try Hawthorne and Horowitz next

If you like a mystery that plays with the business of writing, try The Word Is Murder. Detective Daniel Hawthorne approaches a fictional version of Anthony Horowitz with an unusual proposition: investigate a case together and turn it into a book. Their difficult partnership offers another way into the author's interest in storytellers who find themselves caught inside a crime. It is a separate series, so you do not need another Susan adventure before starting it. The author's introduction to The Word Is Murder (checked 19 October 2026).

Prefer a period detective or another television mystery?

The House of Silk takes Horowitz into Sherlock Holmes's London. Holmes and Watson are approached by an art dealer who fears a threatening stranger; the opening is set in 1890. It is a sensible alternative if Pünd's old-fashioned detective world is the part you most enjoyed. The House of Silk (checked 19 October 2026).

For television, Foyle's War offers another Horowitz-created detective series to explore. His earlier Midsomer Murders work is another connection for viewers who enjoy a self-contained case. Check the relevant broadcaster or streaming service before planning a watch: availability depends on where you live. Horowitz's television credits (checked 19 October 2026).