Writing 26 books and a memoir in his lifetime, John le Carré is widely considered to be one of the best spy novelists of all time.

His son, Simon Cornwell, told Sky News: “I think there was only one thing that was more important to him than his family and that was his writing.”

First gaining attention in 1963 with his breakout novel, The Spy Who Came In From The Cold, cementing his reputation 10 years later with Tinker Tailor Soldier Spy, his work is now enjoying a resurgence.

The Spy Who Came In From The Cold has been adapted for the stage for the first time, with confirmation of a TV series to follow, while another of his works, The Night Manager, premieres its second season starring Tom Hiddleston in the new year.

There are further productions waiting in the wings, plus an unfinished le Carré play with the potential to be developed.

And archives of le Carré’s work – containing over 1,200 boxes of material – have gone on display at the Bodleian Libraries at the University of Oxford.

Writing under a pen name, le Carré, who was born David Cornwell, died in December 2020.

His elder sons, Simon and Stephen, now manage the film, TV and stage rights of his work through their studio The Ink Factory, while his youngest son, Nick, expands the George Smiley universe.

Smiley’s continuation ‘could have gone horribly wrong’

One of le Carré’s most well-known creations, Smiley was the antidote to James Bond – bespectacled, balding and a little out of shape – and a recurring character in le Carré’s books.

Simon says Nick, who has two more Smiley books in the pipeline, was “taking on a big risk” developing the character, but insists, “he is the only person who could have done it and done it that well”.

He goes on: “He could find my father’s voice… he grew up talking every day to my dad, as we did, and he just knows at an instinctive level what’s important…

“There are so many ways in which it could have gone horribly wrong, and it went brilliantly right.”

‘A family enterprise’

Explaining how they all work together – calling it a “family enterprise in the best of ways” – Simon explains: “A lot of authors, when they die, they leave very strict instructions to their children, their estate as to how things should be managed and lots of rules and restrictions and everything else. My dad didn’t do that.”

Le Carré’s fourth son, Tim, sadly died aged 59 in 2022, shortly after editing a collection of his father’s letters, titled A Private Spy.

Le Carré is by no means the only author whose legacy lives on via others.

Announcing a staggered retirement, Lee Child passed his hit creation Jack Reacher on to his younger brother Andrew in 2020.

PG Wodehouse’s much-loved Jeeves and Wooster stories have been rewritten this Christmas by celebrity fans including Frank Skinner and Alan Titchmarsh, half a century after his death.

Staying part of the conversation is key

While Ian Fleming’s James Bond has been continued by 15 authors so far, and spilling into the young adult genre, capturing a whole new generation of readers.

Mark Edlitz, intellectual expert and author of The Many Lives Of James Bond, told Sky News such continuations are essential to the survival of the work.

“We have seen all these detectives and spies who don’t have a movie series or a TV series to bolster their eyeballs, and then they fade from public view.

“These books and movies help keep the author’s work present and viable and part of the public conversation.”

Sarah Baxter, senior contracts advisor for The Society of Authors, says remaining relevant and visible has another big benefit too.

“That kind of partnership can go on to give a whole new lease of life to works that may have been written many, many years ago, and it can go on to generate a lot of income for a literary estate.”

‘An enigma’

More than 60 million copies of Le Carré’s books have been sold worldwide, with new adaptations likely to boost those sales further.

But Simon Cornwell says the investment in his father’s work is about more than just profits.

“We became very, very close as a family because he was very keen to be a proper dad and we were working with him and his material as well, so it was particularly towards the end of his life. It was a beautiful, thrilling thing.”

A master storyteller, the moral ambiguity of the fictional world he constructed reflected back on to its creator.

Simon says: “He remained an enigma. I think in some ways he was probably an enigma to himself…

“He was an extraordinary man to be close with, but do you ever understand somebody like that? Probably not.”

His work more widespread than ever, but the man himself – still a mystery.

The Spy Who Came In From The Cold is at @sohoplace in London’s West End to 21 February before embarking on a UK Tour.

John le Carré: Tradecraft is at the Bodleian Libraries at the University of Oxford until 6 April.