The Complete Early Poirot Omnibus: The Mysterious Affair at Styles; The Murder on the Links; The Man Who Was Number Four; and 25 Others

Hercule Poirot made his first public appearance in 1920 at the age, one guesses, of about 60. He finally breathed his metaphorical last in 1975 at the age of maybe 75 or 80. And in that short span of time - either 55 years or about 20, depending on how you count it - Poirot became one of England's most profitable and ubiquitous export commodities.

But it's very clear that his creator, Agatha Christie, did not at first intend for it to go that way. She made a very definite attempt to end the...