2. The Murder on the Links (1923)

“For God’s sake, come!” But by the time Hercule Poirot can respond to Monsieur Renauld’s plea, the millionaire is already dead—stabbed in the back, and lying in a freshly dug grave on the golf course adjoining his estate. There is no lack of suspects: his wife, whose dagger did the deed; his embittered son; Renauld’s mistress—and each feels deserving of the dead man’s fortune. The police think they’ve found the culprit. Poirot has his doubts. And the discovery of a second, identically murdered corpse complicates matters considerably. (However, on a bright note, Captain Arthur Hastings does meet his future wife.)

• The New York Times: ‘A remarkably good detective story…warmly recommended.’
• Literary Review: ‘Really clever.’
• Sketch: ‘Agatha Christie never lets you down.’

3. Poirot Investigates (1924)

A movie star, a diamond; a murderous ‘suicide’; a pharaoh’s curse upon his tomb; a prime minister abducted…What links these fascinating cases? The brilliant deductive powers of Hercule Poirot in…‘The Adventure of the Western Star’; ‘The Tragedy at Marsdon Manor’; ‘The Adventure of the Cheap Flat’; ‘The Mystery of the Hunter’s Lodge’; ‘The Million Dollar Bond Robbery’; ‘The Adventure of the Egyptian Tomb’; ‘The Jewel Robbery at the Grand Metropolitan’; ‘The Kidnapped Prime Minister’; ‘The Disappearance of Mr. Davenheim’; ‘The Adventure of the Italian Nobleman’; ‘The Case of the Missing Will.’

Of note: The stories collected here were first published in Sketch, beginning on March 7, 1923. Sketch also featured the first illustration of the foppish, egg-headed, elaborately moustachioed Belgian detective.

• Literary Review: ‘A capital collection…ingeniously constructed and told with an engaging lightness of style.’
• Irish Times: ‘In straight detective fiction there is still no one to touch [Christie].’

4. The Murder of Roger Ackroyd (1926)

In the quiet village of King’s Abbot a widow’s suicide has stirred suspicion—and dreadful gossip. There are rumours that she murdered her first husband, that she was being blackmailed, and that her secret lover was Roger Ackroyd. Then, on the verge of discovering the blackmailer’s identity, Ackroyd himself is murdered. Hercule Poirot, who has settled in King’s Abbot for some peace and quiet and a little gardening, finds himself at the centre of the case—and up against a diabolically clever and devious killer.

Of note: The Murder of Roger Ackroyd broke all the rules of detective fiction and made Agatha Christie a household name. Widely regarded as her masterpiece (though perhaps it may be called her ‘Poirot masterpiece’ since other titles in her canon—notably And Then There Were None—are similarly acclaimed), The Murder of Roger Ackroyd was the source of some controversy when it was published. The Times Literary Supplement’s praise of the first Poirot, The Mysterious Affair at Styles, ‘almost too ingenious,’ was applied by scores of readers to Ackroyd, who were nonetheless enraptured by the novel, and have remained so over the decades.

Fair warning: There are two things you must do if you know nothing of the book: discuss it with no one, and read it with all speed.