Two Billion Copies Sold: Agatha Christie's Empire Grows, 50 Years On

By Tom Whitfield

Agatha Christie has sold roughly 2 billion books, making her the best-selling fiction author in the world — fifty years after her death at 85, and with no sign of the market cooling. The machinery around her name keeps expanding: a major exhibition at the British Library, a hit Netflix series and a deliberately youth-cast Poirot now filming in the UK.

The exhibition, "Agatha Christie: A World of Mystery," opens this month at the British Library in London. Visitors will see notebooks, manuscripts, photographs, letters and Christie's own typewriter. It is a rare look inside the working methods of a writer whose sales figures most living novelists can only view from a distance.

Who is adapting Christie right now?

Netflix carries one of the deepest Christie libraries on any streamer:

• "Agatha Christie's Seven Dials," a three-part series starring Mia McKenna-Bruce, dropped in January, produced by Orchid Pictures
• Six seasons of "Marple" with Geraldine McEwan, which debuted in 2004
• Thirteen seasons of the 1990s "Poirot" series starring David Suchet
• Kenneth Branagh's 2022 feature "Death on the Nile," with Tom Bateman and Gal Gadot

Branagh, who also directed feature adaptations of "Murder on the Orient Express" and "A Haunting in Venice," has confirmed he would do more. "Any chance to go back would be great," he said.

Suchet, thirteen years after hanging up Poirot's Homburg hat, is not letting go either. Last year he published the non-fiction book "Travels with Agatha Christie," retracing the author's global journeys, following a 2024 docu-series of the same name.

Who controls the adaptations?

Christie's work remains in copyright. Her literary estate is managed by her great-grandson, James Prichard, CEO of Agatha Christie Limited, which oversees every adaptation. The company, by Mackie's account, does not dictate terms. "James was really sympathetic and supportive of us taking some narrative digressions in order to dramatize 'The Seven Dials Mystery,'" she said.

Those digressions include swapping the book's Lord Caterham for Lady Caterham, played by Helena Bonham Carter. "James couldn't have been more welcoming of that idea, even though it was a big swing," Mackie said. A rights holder that welcomes big swings is itself part of the story; not every estate does.

The BBC and BritBox are taking an equally large one. "Hercule," a six-episode Poirot adaptation now in production in the UK, casts 33-year-old Edward Bluemel as a detective canonically written as 60-something. Speaking at an Agatha Christie panel at the Edinburgh TV Festival in August, Prichard said the show deliberately portrays Poirot "in the 1920s as a younger man, not as the fully-formed detective" — a change, he claimed, his great-grandmother would herself have made given a do-over. That claim is unverifiable, of course. It is also the kind of license an estate holder can grant himself.

"Hercule" forms part of BritBox's stated strategy to become "the home" of Christie, in the words of CEO Robert Schildhouse. The streamer's recent commissions include 2022's "Why Didn't They Ask Evans?" with Will Poulter and Hugh Laurie, last year's "Towards Zero" with Anjelica Huston, and the modernized "Tommy & Tuppence," launched last month.

What does this change for the audience?

In practice: more Christie, faster, and in less familiar shapes. The trend runs from faithful period retellings toward reinvention — younger detectives, gender-swapped characters, modernized settings. Homages crowd the wider market too: "Murder, She Wrote," "Only Murders in the Building" and "Knives Out" all invoke Christie to varying degrees.

For Prichard, the durability is thematic. Christie's recurring subjects — vanity, selfishness, status and revenge — have not dated. "What she was saying about us as humanity is as relevant, if not more so, at this moment in time than it was a hundred years ago," he said.

Mackie puts it more simply. "She's such a consummate storyteller and I think that's why she has such enduring appeal," she said. Two billion copies suggest the audience agrees. The question the British Library exhibition, "Hercule" and the Netflix library will answer over the coming year is which version of Christie the next fifty years will buy.