The Big Four Novel by Agatha Christie

"The Big Four" by Agatha Christie is a standalone novel featuring her famous detective, Hercule Poirot. In this novel, Poirot finds himself in a world of international espionage and crime. A secret organization known as "The Big Four" is wreaking havoc with their criminal activities. Poirot and his friends work together to uncover the identities of the four masterminds behind the organization and to thwart their sinister plans. The story is filled with intrigue, danger, and clever detective work, making it a thrilling and fast-paced read.