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Born Agatha Mary Clarissa Miller in Devon in 1890, her American father, Frederick Miller, died when she was a child and she was brought up and educated by her mother, Clarissa, in Torquay.

She married Archibald Christie, an air force officer just after the start of the First World War and they had a daughter, Rosalind, born in 1919.

Joan Hickson as Miss Marple

Agatha Christie’s first novel introduced the world to the fastidious Belgian detective ‘Hercule Poirot’ in 1920. He was closely followed by busybody ‘Miss Marple’ in 1930. In total Agatha Christie wrote more than 70 detective novels as well as romances and a children’s book under pseudonyms.

Despite her fame as a writer, the one thing Agatha Christie is probably most remembered for is her strange and mysterious disappearance in December 1926.

She was 36 years old and already a successful writer when, on December 3 she left her home in Surrey. Her car was found hanging precariously over the edge of a chalk cliff later the same day.

One of the largest manhunts the country had ever seen was mounted with over 1000 police constables, civilians and for the first time aeroplanes, involved in the search for Agatha Christie.

For 11 days the sole topic of conversation across the country was “what has happened to Agatha Christie?” It was just like a plot from one of her own books.

On December 14 1926, Agatha Christie was found, safe and well, living the high-life in a Harrogate hotel! It seems she’d travelled to London and boarded a train to the spa town after having seen an advertisement at the railway station. She then checked into the Swan Hydro (now the Old Swan Hotel), with almost no luggage, under the name of Theresa Neele – her husband’s mistress!

Old Swan Hotel, Harrogate

Harrogate was (and still is) a fashionable spa town and everyone was terribly elegant. Agatha Christie did nothing to arouse suspicions as she thoroughly enjoyed her stay, joining in with the balls, dances and palm court entertainment.

She was eventually recognised by a banjo player at the hotel, Mr Bob Tappin, who alerted the police. Her husband, Colonel Christie came to collect Agatha immediately but she kept him waiting in the hotel lounge whilst she finished dressing for dinner.

Agatha Christie never spoke about those missing 11 days of her life and over the years there has been much speculation about what happened between 3rd and 14th December 1926.

We know her mother had recently died and there were difficulties in the marriage - they divorced in 1928 - and she was desperately unhappy. Many people wondered if it was all one elaborate publicity stunt. Her husband said she’d suffered a total memory loss, maybe as a result of the crash which left the car hanging on a cliff edge.

Recently, biographer Andrew Norman believes he has uncovered the true reason for her disappearance using medical case studies. He believes she was in the grip of a rare but increasingly recognised medical condition known as a ‘fugue state’. Best described as a period of out-of-body amnesia induced by stress.

However, the true reasons for her disappearance remains a mystery to this day and she took the story of what really happened with her to the grave in 1976.