Christie, Agatha, Three act tragedy: a Hercule Poirot novel a Hercule Poirot novel Murder in three acts Christie, Agatha - Berkley ed. - New York : Berkley Books, 1984, c1934. - 319 p. ; 18 cm. - Berkley mystery . Also published as: "Murder in three acts." ISBN: 0007120907 Subjects--Topical Terms: Poirot, Hercule (Fictitious character) Index Terms--Genre/Form: Mystery fiction.