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The Mysterious Affair at Styles is a detective novel by Agatha Christie. It was written in the middle of World War I, in 1916, and first published by John Lane in the United States in October 1920 and in the United Kingdom by The Bodley Head on 21 January 1921. The US edition retailed at US$2.00 and the UK edition at …

The Mystery of the Blue Train is a work of detective fiction by Agatha Christie, first published in the United Kingdom by William Collins & Sons on 29 March 1928 and in the United States by Dodd, Mead and Company later in the same year. The UK edition retailed at seven shillings and sixpence and the US edition at …