In 1918 Archie takes up his post at the Air Ministry and he and Agatha moved to a flat in St John’s Wood.
In 1919 Agatha gets pregnant, so they have to find a new place to live. They need a bigger flat, and Agatha finds one in Addison Mansions, near Holland Park. Agatha had her daughter, Rosalind, in Torquay.
Shortly after the birth of Rosalind, Agatha finally got a publisher for her novel. After keeping the submission for several months, John Lane at The Bodley Head offered to accept it, provided that Christie change the ending. She did so, and signed a contract which she later felt was exploitative. It was finally published in 1920.