High Quality Content by WIKIPEDIA articles! The Seven Dials Mystery is a work of detective fiction by Agatha Christie and first published in the UK by William Collins & Sons on January 24, 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 (Bundle) Brent, Lord Caterham, Bill Eversleigh, George Lomax, Tredwell and Superintendent Battle. The UK edition retailed at seven shillings and sixpence (7/6) and the US edition at $2.00.