The Big Four

This fifth book in Agatha Christie's renowned detective series follows Hercules Poirot's latest investigation. His newest case will see him exploring the world of international intrigue and espionage in this twisty mystery that only a detective like Poirot could hope to untangle.

This action-fueled mystery begins with a mysterious man arriving on Poirot's doorstep—only to drop dead moments later before he can convey crucial information about what led to his fatal condition. What follows will be one of Poirot's most dangerous investigations as he tangles with an international crime syndicate known as "The Big Four" in a race to stop their dastardly plans from coming to fruition.