The Woolleys invited her back the following season, and it was then that she encountered her second husband Max Mallowan.

During the Second World War, Christie wrote two novels, Curtain and Sleeping Murder, featuring Hercule Poirot and Miss Marple, respectively. In late February 2014, media reports stated that the BBC had acquired exclusive TV rights to Christie's works in the UK (previously associated with ITV) and made plans with Acorn's co-operation to air new productions for the 125th anniversary of Christie's birth in 2015. After keeping the submission for several months, John Lane at The Bodley Head offered to accept it, provided that Christie change how the solution was revealed. The 12 short stories which introduced him, Parker Pyne Investigates (1934), are best remembered for "The Case of the Discontented Soldier", which features Ariadne Oliver, "an amusing and satirical self-portrait of Agatha Christie". The two winters and one summer that I spent in Paris were some of the happiest days I have ever known.Both books were sealed in a bank vault, and she made over the copyrights by deed of gift to her daughter and her husband to provide each with a kind of insurance policy. Christie died peacefully on 12 January 1976 at age 85 from natural causes at her home at Winterbrook House. The people she met would form the basis for many a plot, not least the forceful figure of Major Belcher, their travelling companion, who provided the inspiration for a character in 1924’s The Man in the Brown Suit.

The trip cemented Agatha’s passion for adventure and travel, taking in South Africa, Botswana, Zimbabwe, Zambia, Australia, New Zealand, Fiji, Hawaii, Canada and mainland USA. A chapter each was completed by: Canon Victor Whitechurch, George and Margaret Cole, Henry Wade, Agatha Christie, John Rhode, Milward Kennedy, Sayers, Ronald Knox, Freeman Wills Crofts, Edgar Jepson, Clemence Dane and Anthony Berkeley.

She also wrote the world's longest-running play, the murder mystery The Mousetrap, which has been performed in the West End since 1952. In October 1912, she was introduced to Archibald "Archie" Christie at a dance given by Lord and Lady Clifford at Ugbrooke, about 12 miles (19 km) from Torquay. The pair travelled frequently on archaeological expeditions, and she utilized the experiences she had while on her many adventures as a basis for some plots, including Murder on the Orient Express (1934), Murder in Mesopotamia (1936) and Death on the Nile (1937). The first of her own stage works was Black Coffee, which received good reviews when it opened in the West End in late 1930. Mallowan described these tales as "detection in a fanciful vein, touching on the fairy story, a natural product of Agatha's peculiar imagination".

Jewish characters are often seen as un-English (such as Oliver Manders in Three Act Tragedy), but they are rarely the culprits. The autumn of 1928 proved a turning point for Agatha after a chance meeting at a dinner party led her to book a journey alone on the legendary Orient Express. Four short stories, including "The Submarine Plans," "Christmas Adventure," "The Mystery of the Baghdad Chest," and "The Second Gong," were expanded into longer stories by Christie (respectively "The Incredible Theft," "The Adventure of the Christmas Pudding," "The Mystery of the Spanish Chest," and "Dead Man's Mirror").Her first husband was Archibald Christie; they married in 1914 and had one child before divorcing in 1928. In 1914 Agatha married Archie Christie, and eight years later in 1922 they set sail on a 10-month voyage as part of a trade mission to promote the forthcoming British Empire Exhibition.

As of 2019 [update] the play was still running; [43] in 2009 the London run exceeded 25,000 performances. There's a few nods to her works, though by and large it could be any spirited Victorian girl who loves mysteries and always speaks her mind. her book is far above the average of current fiction, in fact, comes well under the classification of a 'good book'.Agatha rose to the challenge, at the same time seeking to relieve some of the monotony of dispensing. The atmosphere of the Middle East was not lost on her, as can be seen in novels such as Murder on the Orient Express, Death on the Nile (inspired by a trip with Max and Rosalind), Murder in Mesopotamia, Appointment With Death and They Came to Baghdad as well as many short stories, including several of the Parker Pyne tales, featuring a civil servant turned happiness consultant. Late in 1928 Agatha also wrote her first novel under the pseudonym Mary Westmacott, Giant’s Bread - not a detective story but a work of fiction about a composer who reinvents his identity.