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Cover image of Casa Carlini's The Big Four ebook featuring Agatha Christie's name and a mysterious, noir-inspired design.

The Big Four

$9.99
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Print editions:

  • Most orders ship in 2–3 business days
  • Standard delivery 5–7 business days; international 10–20 business days
  • Free standard shipping on orders over $25 to the US, Canada & UK; other shipping costs are calculated at checkout

Ebook & audiobook:

  • Digital format · no shipping required
  • Ebook: EPUB file, delivered instantly by email

A global conspiracy. Four powerful criminals. And Hercule Poirot faces his greatest challenge yet.

When Hercule Poirot is drawn into a dangerous international conspiracy, he discovers that the world’s most powerful criminal organization is controlled by four mysterious figures known only as “The Big Four.” Alongside Captain Hastings, Poirot investigates a series of crimes spanning continents, confronting a brilliant scientist, a ruthless financier, a skilled assassin, and a shadowy mastermind determined to reshape the world.

More a thrilling adventure than a traditional whodunit, The Big Four showcases Christie’s ability to blend espionage, suspense, and detective fiction into a fast-paced story filled with intrigue and deception.

  • First published in 1927
  • Features Hercule Poirot and Captain Hastings in a globe-spanning adventure
  • A unique Christie mystery combining crime, espionage, and international conspiracy

Formats and delivery

Paperback — Elegant print edition presenting the complete, unabridged text, and ships in 3–5 business days.
Hardcover — Elegant print edition presenting the complete, unabridged text, and ships in 5–7 business days.
EPUB — DRM-free, compatible with Kindle, Kobo, Apple Books, and all major e-readers. Instant download after purchase.
Audiobook — Professionally narrated, complete, and unabridged. Available on Audible, Spotify, Apple Books.

A thrilling departure from Christie’s traditional mysteries that highlights her versatility as a storyteller while delivering a gripping battle of wits between detective and criminal mastermind.

About the Author

Agatha Christie (1890–1976) was an English novelist and playwright widely regarded as the greatest mystery writer in history. Best known for creating the legendary detectives Hercule Poirot and Miss Marple, Christie wrote more than sixty detective novels, including Murder on the Orient Express, The Murder of Roger Ackroyd, and And Then There Were None. Her ingenious plots, unforgettable characters, and masterful use of suspense have made her the best-selling fiction writer of all time, with billions of copies of her works sold worldwide.

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