Adaptation of third Susan Ryeland mystery

As expected, BBC is adapting Marble Hall Murders for television. This
was written by Anthony Horowitz, a television writer, so I'm sure it was
readily adaptable. It's the third in a trilogy of novels featuring Susan
Ryeland, the fired book editor solves murder mysteries using clues put
into a series of novels featuring Atticus Pund written by Alan Conway.
Conway put caricatures of real people he interacted with into his novels
based on interviews with them; his novels are filled with enough real
world details to allow Ms. Ryeland to solve real-world crimes. She
bounces ideas off her own imaginary Pund.

The storytelling has three layers, all intercut: The "present" with
Susan Ryeland; the backstory with Conway's interactions with the people
he'll write into his novels, and portions of the novel itself, with the
same actors used to portray their own caricatures in the novel.

This time, Conway is dispensed with as a new writer was hired to write a
final Pund novel, and there is once again a real-world murder to solve.

Till reading the article, I had forgotten that the first adaptation,
Magpie Murders, had been produced for streaming on BritBox UK. I think I
vaguely recall that it was streamed on the US version of BritBox before
the PBS broadcast. But Mayflower Murders and now Marble Hall Murders
were produced for BBC One.

The series has been deliberately formulaic as the mysteries all have
recognizeable plot elements from various mystery writers (especially
Agatha Christie) and the suspects aren't fully-drawn characters but plot
devices. I never thought the slapstick humor worked in the second
series with Susan and her Greek husband trying to run a destination
resort that neither has the business skills for. Still, it's fun... if
you carefully pay attention to which of the three story layers is being
shown at the moment.

https://www.radiotimes.com/tv/drama/marble-hall-murders-lesley-manville-commission-newsupdate/