Three Act Tragedy is a work of detective fiction by British writer Agatha Christie, first published in the United States by Dodd, Mead and Company in 1934 under the title Murder in Three Acts and in the UK by the Collins Crime Club in January 1935 under Christie's original title. The US edition retailed at $2.00 and the UK edition at seven shillings and sixpence (7/6).

Mrs McGinty's Dead is a work of detective fiction by British writer Agatha Christie, first published in the US by Dodd, Mead and Company in February 1952 and in the UK by the Collins Crime Club on 3 March the same year. The US edition retailed at $2.50 and the UK edition at nine shillings and sixpence (9/6). The Detective Book Club issued an edition, also in 1952, as Blood Will Tell.