Agatha Christie 2 billion copies, and her estate claims that her works come third in the rankings of the world's most-widely published books, behind only Shakespeare's works and the Bible. According to Index Translationum, she remains the most-translated individual author, having been translated into at least 103 languages. "And Then There Were None" is Christie's best-selling novel, with 100 million sales to date, making it the world's best-selling mystery ever, and one of the best-selling books of all time. Christie's stage play "The Mousetrap" holds the world record for longest initial run. It opened at the Ambassadors Theatre in the West End
Robin Stevens (author) Stevens studied English at the University of Warwick, later gaining an MA in crime fiction from King's College London. She appeared as Captain of the Warwick University team on University Challenge. Before becoming a full-time author, Stevens worked as a bookseller at Blackwell's bookshop in Oxford, and as an editor at Egmont. Stevens started writing "Murder Most Unladylike" as part of National Novel Writing Month in November 2010, but did not send it to agencies for two years. Stevens has cited the Golden Age of Detective Fiction as an influence on her work – particularly the authors Agatha Christie, Ngaio