The novel has been translated into Persian by Nora Navapour. Tehran-based Kamak Publishing has released 'The Postscript Murders' in 402 pages.

The death of a ninety-year-old woman with a heart condition should not be suspicious. Detective Sergeant Harbinder Kaur certainly sees nothing out of the ordinary when Peggy's caretaker, Natalka, begins to recount Peggy Smith's passing.

But Natalka had a reason to be at the police station: while clearing out Peggy's flat, she noticed an unusual number of crime novels, all dedicated to Peggy. And each psychological thriller included a mysterious postscript: PS: for PS. When a gunman breaks into the flat to steal a book and its author is found dead shortly thereafter--Detective Kaur begins to think that perhaps there is no such thing as an unsuspicious death after all.

And then things escalate: from an Aberdeen literary festival to the streets of Edinburgh, writers are being targeted. DS Kaur embarks on a road trip across Europe and reckons with how exactly authors can think up such realistic crimes . . .

Griffiths ' first series features as a main character forensic archaeologist Ruth Galloway, who lives in a remote seaside cottage near King's Lynn in Norfolk and teaches at the University of North Norfolk.

Griffiths' second series, set in 1950s Brighton, focuses on the duo of Detective Inspector Edgar Stephens and magician Max Mephisto. Griffiths released the first book in this series, The Zig Zag Girl, in 2014

In 2017, Griffiths was the Programming Chair for the Theakston's Old Peculier Crime Writing Festival, part of the Harrogate International Festivals portfolio.

Griffiths won the 2020 Edgar Allan Poe Award for Best Novel for 'The Stranger Diaries'. In 2021, 'The Postscript Murders' was shortlisted in the Gold Dagger category at the Crime Writers' Association Awards.