The Big Four (1927) pits Hercule Poirot against his most ambitious adversaries: a shadowy international cartel bent on world domination. When a gaunt stranger staggers into Poirot’s flat and scrawls a cryptic list of four names before collapsing, the Belgian detective is drawn into a globe-spanning conspiracy unlike anything he has faced before.
Assembled from a series of linked stories, the novel is one of Christie’s most action-driven works — part thriller, part spy adventure, part detective puzzle. Download the free EPUB for a propulsive read that showcases Poirot at his most daring.