The Big Four

Agatha Christie

Summary

Hercule Poirot faces his most dangerous challenge yet as a mysterious organization threatens to change the world.

When Hercule Poirot encounters a strange and seemingly impossible case, he soon finds himself drawn into a dangerous international conspiracy. At its center are four powerful figures whose influence reaches far beyond a single crime.

As Poirot follows a trail of deception, secret identities, international intrigue, and deadly schemes, the investigation takes him far beyond the traditional country-house mystery. With danger appearing at every turn, Poirot must rely on his intelligence, observation, and extraordinary ability to understand human motives.

The Big Four offers a thrilling departure from Christie's more traditional mysteries, combining detective fiction with espionage and adventure.

Follow Hercule Poirot into a world of international conspiracy, danger, and deception.

Available since: 09/15/2026.

Print length: 198 pages.

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