8. Peril at End House (1932)

Nick is an unusual name for a pretty young woman. And Nick Buckley has been leading an unusual life of late. First, on a treacherous Cornish hillside, the brakes on her car fail. Then, on a coastal path, a falling boulder misses her by inches. Safe in bed, she is almost crushed by a painting. Upon discovering a bullet hole in Nick’s sun hat, Hercule Poirot (who had come to Cornwall for a simple holiday with his friend Captain Hastings) decides that the girl needs his protection. At the same time, he begins to unravel the mystery of a murder that hasn’t been committed. Yet.

• Times Literary Supplement: ‘Ingenious.’

9. Lord Edgware Dies (1933)

Poirot was present when the beautiful actress Jane Wilkinson bragged of her plan to ‘get rid of’ her estranged husband. Now the monstrous man is dead. But how could Jane have stabbed Lord Edgware in his library at exactly the time she was dining with friends? And what could have been her motive, since Edgware had finally granted her a divorce? The great Belgian detective, aided by Captain Hastings, can’t help feeling that some kind of heinous stagecraft is in play. And does more murder wait in the wings?

• The New York Times: ‘A most ingenious crime puzzle.’
• Times Literary Supplement: ‘The whole case is a triumph of Poirot’s special qualities.’
• Noted crime fiction critic Julian Symons selected Lord Edgware Dies as one of Agatha Christie’s best.

10. Murder on the Orient Express (1934)

Just after midnight, a snowstorm stops the Orient Express dead in its tracks in the middle of Yugoslavia. The luxurious train is surprisingly full for this time of year. But by morning there is one passenger less. A ‘respectable American gentleman’ lies dead in his compartment, stabbed a dozen times, his door locked from the inside…Hercule Poirot is also aboard, having arrived in the nick of time to claim a second-class compartment—and the most astounding case of his illustrious career.

Regarding chronology: Agatha Christie seems not much concerned in the course of her books with their relationship to each other. It is why the Marples and the Poirots may be ready in any order, really, with pleasure. However, the dedicated Poirotist may wish to note that the great detective is returning from ‘A little affair in Syria’ at the start of Murder on the Orient Express. It is a piece of business after this ‘little affair’—the investigation into the death of an archaeologist’s wife—that is the subject of Murder in Mesopotamia (1936). If one wishes to delay a tad longer the pleasures of Orient Express, Murder in Mesopotamia offers no better opportunity.

Fair warning: Along these lines, it is advisable that one not read Cards on the Table (1936) prior to Orient Express, since Poirot himself casually gives away the ending to the latter novel.

Of note: Murder on the Orient Express is one of Agatha Christie’s most famous novels, owing no doubt to a combination of its romantic setting and the ingeniousness of its plot; its non-exploitative reference to the sensational kidnapping and murder of the infant son of Charles and Anne Morrow Lindbergh only two years prior; and a popular 1974 film adaptation, starring Albert Finney as Poirot—one of the few cinematic versions of a Christie work that met with the approval, however mild, of the author herself.