The Big Four book cover by Agatha Christie

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Last checked: October 28, 2026

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The Big Four next to each book above. A dot means both books' records carry that fact.

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The Big Four: the facts, checked

Each line names the page it was checked on and the date.

First published
First published on January 27, 1927. Source: Wikidata, checked November 6, 2026.
Series
It is book 4 of the Hercule Poirot series. Source: agathachristie.com, checked November 6, 2026. Hercule Poirot ... The Murder of Roger Ackroyd ... The Big Four
Next in the series
Book 5 is The Mystery of the Blue Train. Source: agathachristie.com, checked November 6, 2026. The Big Four ... The Mystery of the Blue Train

About Agatha Christie

Born
Born in Ashfield, United Kingdom, in 1890. Source: Wikidata and the place's own entry, checked November 6, 2026.
Also writes as
Agatha Christie has also published as Mary Westmacott. Source: Wikidata, citing Encyclopædia Britannica Online, checked November 6, 2026.
Awards and honors
Agatha Christie received the Grand Master in 1955. Source: Wikidata, citing edgarawards.com, checked November 6, 2026.

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What does the Why line mean?

It names what the two books have in common, using only facts found in both books' catalog records. Tap What both books share to see those facts and where they came from. When the shared facts are few, the line is short. It never quotes reviews, ratings or reader reactions.

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