Poirot's Timeline

 1904--Poirot retires from Belgian police force as detective

Has own practice in Europe, meets Inspector James Japp & later Captain Arthur Hastings

 1916--Arrives to England as a Belgian refugee from WWI

Aided by Mrs. Inglethorpe of Styles Court, meets Hastings again

Solves murder at Styles Court with Hastings & Japp

Sets up practice in England, moves to 14 Farraway Street, London, with Hastings

 1923--Poirot & Hastings solve murder in France, Hastings marries Dulcie and moves to Argentina

 1925?--Poirot solves jewel theft, meets the Russian Countess Vera Rossakoff for first time

 1926--Poirot unmasks member of the "Big Four" with Hastings, meets with Countess Rossakoff again

Retires and goes to King's Abbot to grow vegetable marrows for a year, solves the murder of Mr. Ackroyd

 1928--While in France, Poirot solves a jewel theft & murder of American heiress, hires Georges as valet

 1932--Poirot & Hastings (back from Argentina) are vacationing in St. Loo and uncover murder attempts

 1934?--Poirot moves to 28 Whitehaven Mansions

 1935--Poirot travels in airplane to England where a French moneylender is murdered, Japp helps

Poirot solves ABC Murders with Hastings (visits from Argentina) & Japp

 1936--Poirot and fellow sleuths Colonel Race, Battle, and Ariadne Oliver solve murder of dinner host

 1937--Poirot meets Colonel Race again and solves murder on the Nile River

Hastings helps Poirot solve case about "accident" of old lady

Poirot & Inspector Japp investigate a girl's suicide/murder

 1939?--Felicity Lemon is hired by Poirot to be his secretary

 1941--Poirot goes to the Jolly Roger Hotel and solves crime there

 1946--Poirot unexpectedly sees Countess Rossakoff years later, now as a proprietor of a nightclub

 1948--Poirot travels to Warmsley Vale to solve murder of young wife

 1952--Poirot, Mrs. Oliver, Spence join to solve old lady's murder and clear an innocent man

 1955--Miss Lemon's sister comes to Poirot asking for help at youth hostel

 1956--Mrs. Oliver asks Poirot to help in a real murder hunt of a young girl

 1963--Colin Lamb asks Poirot for help in murder of an unknown man

 1969--Poirot joins forces with Spence (and Mrs. Oliver) in a Halloween Party murder

 1972--Poirot helps Mrs. Oliver & Spence solve a decades-old murder/suicide

 1975--Georges leaves employ of Poirot, Poirot goes to Styles Court

Poirot & Hastings track down murderer in Poirot's last case at Styles

Hercule Poirot, Belgian detective, dies at Styles Court