The Big Four

Name: The Big Four
Rating: 3.57 (75766 reviews)
Author: Agatha Christie, Sara Martin

Hercule Poirot • Book 5

by Agatha Christie, Sara Martin

3.57 Goodreads

(75.8K ratings)

144 pages Published 1927 Mystery

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Why You'll Love This

Christie pits Poirot against a secret society bent on world domination — and it's as gloriously strange as that sounds.

Great if you want: a Poirot adventure with spy-thriller energy over drawing-room mystery
The experience: fast and episodic — reads more like linked vignettes than one sustained plot
The writing: Christie keeps the wit sharp even when the premise strains credibility
Skip if: you prefer Christie's tightly plotted whodunits over pulpy adventure yarns

About This Book

Hercule Poirot has solved murders in country houses and on luxury trains, but The Big Four throws him into something far more unsettling — a conspiracy of global proportions. When a near-dead stranger appears with a cryptic message, Poirot finds himself drawn into a shadowy world of spies, secret societies, and four powerful figures whose ambitions reach beyond crime into something closer to world domination. The stakes here are not a single life but the fate of nations, and Christie wraps that enormous threat around her small, fastidious Belgian detective with genuinely unnerving effect.

What makes this entry in the Poirot series worth reading is precisely its strangeness. Christie stretches her signature tight plotting into something more episodic and pulpy, borrowing from the thriller tradition in ways that feel deliberately experimental. The result is a book with a different rhythm than her drawing-room mysteries — faster, looser, stranger — and that contrast rewards readers who think they already know what a Poirot novel feels like. It's Christie testing her own formula, and the friction that creates is consistently interesting.