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The Thirteen Problems is a short story collection written by Agatha Christie and first published in the UK by Collins Crime Club in June 1932 and in the US by Dodd, Mead and Company in 1933 under the title The Tuesday Club Murders. The UK edition retailed at seven shillings and sixpence and the US edition at $2.00. …

The Seven Dials Mystery is a work of detective fiction by Agatha Christie, first published in the UK by William Collins & Sons on 24 January 1929 and in the US by Dodd, Mead and Company later in the same year. In it, Christie brings back the characters from an earlier novel, The Secret of Chimneys: Lady Eileen …