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The Big Four is a work of detective fiction by Agatha Christie, first published in the UK by William Collins & Sons on 27 January 1927 and in the US by Dodd, Mead and Company later in the same year. It features Hercule Poirot, Arthur Hastings, and Inspector Japp. The UK edition retailed at seven shillings and …

The Body in the Library is a work of detective fiction by Agatha Christie and first published in the US by Dodd, Mead and Company in February 1942 and in UK by the Collins Crime Club in May of the same year. The US edition retailed at $2.00 and the UK edition at seven shillings and sixpence. The novel features her …

The Burden is a novel written by Agatha Christie and first published in the UK by Heinemann on 12 November 1956. Initially not published in the US, it was later issued as a paperback by Dell Publishing in September 1963. It was the last of six novels Christie wrote under the nom-de-plume Mary Westmacott.