? Four ruthless masterminds. One brilliant detective. A conspiracy that spans the world.
When a mysterious visitor collapses at Hercule Poirot's doorstep, the great detective is drawn into a web of international intrigue unlike anything he has faced before.

Behind a series of murders, kidnappings, and coded messages lies the sinister organization known only as The Big Four — a secret alliance plotting to dominate the world through power, fear, and manipulation.
With Captain Hastings by his side, Poirot must match wits against the most formidable enemies of his career — including a criminal genius whose intelligence rivals his own.

The Big Four combines Christie's razor-sharp plotting with the tension of an international thriller, delivering relentless twists, deadly traps, and a mystery that tests the limits of Poirot's legendary "little grey cells."

?️ Click "Buy Now" and face The Big Four — a gripping Agatha Christie classic where espionage meets deduction and no one can be trusted.