Forty-odd years ago, Patricia Cornwell had a dream. She had quit her job as a crime reporter at The Charlotte Observer and relocated to Richmond, Virginia. Twenty-seven years old, anxious and unmoored, she was trying and failing to write her first novel, a murder mystery. It was not going well.

But in the dead of night, fast asleep, she received a ghostly visitor. In her dream, she was standing in a long line of people, waiting to see an elderly British woman signing books. The black-clad woman, her face shielded by a large black hat, looked up at the bemused Conwell and told her: 'You will take my place.' The woman was Agatha Christie.

Cornwell, who turns 70 next month, today laughs at the memory. At the time, she wasn't particularly familiar with Christie - the world's best-selling author, outsold only by William Shakespeare and the Bible. Cornwell had only read one of her books and is adamant she hadn't ever seen her face. But she looked up a photo in an encyclopedia the following day, and discovered it was undeniably Christie.

'For years, I never told anybody about it,' she told the Daily Mail, speaking from the soundproofed writing room in her waterfront Boston penthouse. 'I thought they would think, one, that I'm a cookie bird, and two, that it sounds unbelievably presumptuous.

'I'm not going to take her place. I never have, and I never will. Nobody's going to take her place. I don't know what that was about, but what it did for me at that time is I thought: maybe, this isn't hopeless.'

Cornwell might not have taken Christie's place, but she certainly creeps close.

In a prolific four-decade career, Cornwell has sold over 120 million copies of her books - remove the romance authors, and among living women writers only JK Rowling comes anywhere near.

It's bought her fame - she now moves with a phalanx of bodyguards - and fortune. Signed pictures of Agatha Christie, Harriet Beecher Stowe - a distant relative - and Ernest Hemingway hang behind her desk. She's open about her love of private jets, designer labels - Chanel and Escada are particular favorites - and stays at the Beverly Hills Hotel. For years, she drove Ferraris and flew her own helicopter - habits she's only abandoned recently due to snarled Boston traffic and annoying drones.

Yet now, both fame and fortune are rocketing anew.

An Amazon Prime series based on her Scarpetta novels launched in March, with Nicole Kidman as chief medical officer Dr Kay Scarpetta, and Jamie Lee Curtis as her zany, eccentric sister Dorothy. It's a wild ride, blending forensic pathology and family drama, and a hit with audiences. The eight-part series topped Prime's charts worldwide, and a second season has already been commissioned.

Cornwell has a cameo in Scarpetta - she plays the judge that swears in Kidman - and said coming face to face with the character she created was electric.

'I had the craziest, weirdest feeling that Scarpetta was looking at me, and I completely forgot what I was going to say,' she said. 'My mind was totally wiped clean, like somebody shot me with a high-energy weapon. Boom!'

This month, she also publishes her autobiography, True Crime: A Memoir, but Cornwell said the timing of the book and the TV series was entirely coincidental. Yet another classic Cornwell sign from the stars, she said.

'I started writing at the very end of December 2024, beginning of 2025,' she said. 'And just two months earlier, Charlie Cornwell had died.'

Cornwell had married Charlie, her English professor at North Carolina's Davidson College, in June 1980.They divorced in 1988, when he wanted to move to Texas for a job as a minister at a church in Dallas.

She now sees herself as bisexual, and in 2005 married Harvard neuroscientist and psychiatry professor Dr Staci Gruber.

Did her ex-husband's death release her to write the memoir?

Cornwell said no - the book, she insisted, was written after a TV series about her life was proposed, and the script was found to be riddled with errors.

But the fates certainly propelled her.

'I'd always said I was never going to write my memoir, but I can promise you this: if I was going to, I wouldn't have done it while he was still here. Because he wouldn't have appreciated it. And my mother, I never could have told this while she was alive, and she just died three years ago.

'I think they all fled, because they knew this was going to happen. They knew it, and I didn't.'

It's easy to see why they wouldn't want, as Cornwell put it, to stick around for publication.

The Florida-born author provides an unflinching, at times brutal, account of her life. It begins with her aloof and troubled lawyer father, who walked out on a five-year-old Cornwell and her two brothers on Christmas Day, then kidnapped the trio two years later and spirited them away to a friend's barge.

Then, her mentally ill mother fled with the children to the rural mountains of North Carolina, to be close to evangelist Billy Graham, whom she'd seen speak. Ruth Graham, Billy's wife, would become a surrogate mother and mentor - especially when both she and her mother were institutionalized: Cornwell for a severe eating disorder, and her mother for paranoid schizophrenia.

And, horrifically, she was sexually assaulted aged five by a recently-released pedophile who had been hired by their neighborhood association to patrol. Many years later, she was date raped by a North Carolina police officer, whom she took for dinner after he helped her with a story.

It's no wonder she writes with such authenticity about the dangers lurking around every corner. And yet Cornwell insists she is 'squeamish, and can't watch scary or depressing movies.'

She wrote: 'I can't abide violence, which is why I feel compelled to write about it.

'I find most of my research all but unbearable. I endure it because I must if I'm to tell the truth in my stories, whether nonfiction or imagined. To witness gore and suffering is fascinating while indescribably awful, and I pay a high price. Disaster and violence await around every corner. Wherever I am, I spot something potentially fatal.'

Wouldn't it be easier, I ask, to turn her hand to historical fiction, perhaps, or biographies? Her intense research - enlisting as a volunteer police officer; getting a job in a morgue; witnessing thousands of autopsies - is certainly not for the faint of heart.

'Sometimes what you're scared of and what repels you is also what you need to explore,' she answered.

'I guarantee you, if you were the early archaeologist who discovered King Tut's tomb, I bet it wasn't a pleasant process. But would you not do it if you could learn something that most people don't know? And my curiosity is far stronger than my resistance at doing something that is scary, whether it's scuba diving, learning to fly a helicopter - soloing in a helicopter where your knees are shaking. I had to start singing to myself; it was so unpleasant to listen to my own singing that I forgot to be scared of the helicopter.'

With almost unlimited access nowadays - she's been invited to NASA and the White House; Scotland Yard and the FBI's Quantico headquarters - does she ever write scenarios just because she wants to learn about them?

'I do that all the time,' she said. 'One of the keys to success is: Just show up. Don't sit in your armchair and look at the internet. I mean, I get a lot of great details off the internet, but in terms of really emotionally being able to embrace a scene and project it to an audience in a way that's palpable, I have to go, or have to experience something.

'I draw the line when it's against my values, or morals, or even good mental health, you know? Like when someone volunteered to cook human flesh for me in a research facility, if I wanted to know what it smelled like, and I said, 'No. I'm not going that far.' That's not what that person intended to have happen, that some silly crime novelist is going to do that with their remains.

'Or if someone offered me to try a Y incision on a body, which I've never done and never will, I wouldn't. That's not appropriate. I can't tell you exactly what that feels like, but I can imagine it, I've seen enough of them.

'So, I do draw the line. Although most people would say my line's a lot farther off-field than theirs is.'

She is unimpressed with most television crime series, writing: 'The TV sensations like CSI and NCIS had dented my enthusiasm. I found it hugely insulting when strangers asked me if shows like that were where I got my ideas.'

What is it about the shows she dislikes?

'It's not dislike - it's just not something I watch,' she said, pointing out that it was far from relaxing.

'Unfortunately, what I'm going to do is say, wait a minute, that's not how you do that. A scanning electron microscope doesn't work like that. Where's the trace evidence? What did you do here, that DNA, or you just contaminated the crime scene?

'I'm the town crier for murder, mayhem and mistakes.'

It's surprising to me, I say, that someone so forensic in her work can be so in thrall to premonitions, fate and the paranormal. Cornwell believes in Bigfoot, and thinks she has seen an Unidentified Aerial Phenomena; the next Scarpetta book, her 30th, which she is currently finishing, has seen her delve into the work of 19th-century American clairvoyant Edgar Cayce.

But is it strange to mix the scientific and the speculative?

'The more you know about science, then the more you know what Einstein said when he spoke about spooky, spooky happenings from a distance, when they were starting to develop quantum mechanics, quantum physics,' she said.

'And the more you learn, the more you appreciate that person who said that magic is simply misunderstood science.'