Agatha Christie was a mystery writer who was one of the world's top-selling authors with works like 'Murder on the Orient Express' and 'The Mystery of the Blue Train.'

Who Was Agatha Christie? Best-selling author Agatha Christie published her first novel, The Mysterious Affair at Styles, in 1920, and went on to become one of the most famous writers in history, with mysteries like Murder at the Vicarage, Partners in Crime and Sad Cypress. She sold billions of copies of her work and was also a noted playwright and romance author.

Early Life and Background Christie was born Agatha Mary Clarissa Miller on September 15, 1890, in Torquay, Devon, in the southwest part of England. The youngest of three siblings, she was educated at home by her mother, who encouraged her daughter to write. As a child, Christie enjoyed fantasy play and creating characters, and, when she was 16, she moved to Paris for a time to study vocals and piano. In 1914, she wed Colonel Archibald Christie, a Royal Flying Corps pilot, and took up nursing during World War I. She published her first book, The Mysterious Affair at Styles, in 1920; the story focused on the murder of a rich heiress and introduced readers to one of Christie's most famous characters—Belgian detective Hercule Poirot.

Books and Disappearance In 1926, Christie released The Murder of Roger Ackroyd, a hit which was later marked as a genre classic and one of the author's all-time favorites. She dealt with tumult that same year, however, as her mother died and her husband revealed that he was in a relationship with another woman. Traumatized by the revelation, Christie disappeared only to be discovered by authorities several days later at a Harrogate hotel, registered under the name of her husband's mistress. Christie would recover, with her and Archibald divorcing in 1928. In 1930, she married archaeology professor Max Mallowan, with whom she traveled on several expeditions, later recounting her trips in the 1946 memoir Come, Tell Me How You Live. The year of her new nuptials also saw the release of Murder at the Vicarage, which became another classic and introduced readers to Miss Jane Marple, an enquiring village lady.

Cast of Characters Poirot and Marple are Christie's most well-known detectives, with the two featured in dozens of novels and short stories. Poirot made the most appearances in Christie's work in titles that included Ackroyd, The Mystery of the Blue Train (1928) and Death in the Clouds (1935). Miss Marple has been featured in books like The Moving Finger (1942) and A Pocket Full of Rye (1953), and been played on screen by actresses like Angela Lansbury, Helen Hayes and Geraldine McEwan. Other notable Christie characters include Tuppence and Tommy Beresford, Colonel Race, Parker Pyne and Ariadne Oliver.

Sold More Than Two Billion Copies Writing well into her later years, Christie wrote more than 70 detective novels as well as short fiction. Though she also wrote romance novels like Unfinished Portrait (1934) and A Daughter's a Daughter (1952) under the name Mary Westmacott, Christie's success as an author of sleuth stories has earned her titles like the "Queen of Crime" and the "Queen of Mystery." Christie can also be considered a queen of all publishing genres as she is one of the top-selling authors in history, with her combined works selling more than 2 billion copies worldwide. Christie was a renowned playwright as well, with works like The Hollow (1951) and Verdict (1958). Her play The Mousetrap opened in 1952 at the Ambassador Theatre and—at more than 8,800 showings during 21 years—holds the record for the longest unbroken run in a London theater. Additionally, several of Christie's works have become popular movies, including Murder on the Orient Express (1974) and Death on the Nile (1978). Christie was made a dame in 1971. In 1974, she made her last public appearance for the opening night of the play version of Murder on the Orient Express. Christie died on January 12, 1976.