Christie's writing career began during the war after she was challenged by her sister to write a detective story; she produced The Mysterious Affair at Styles, which was turned down by two publishers before it was published in 1920.
Karier penulisan Christie dimulai setelah perang setelah ia bersaing dengan saudarinya untuk menulis sebuah cerita detektif; ia membuat The Mysterious Affair at Styles, yang diurungkan oleh dua penerbit sebelum karya tersebut kemudian diterbitkan pada 1920.