Agatha Christie 
The Big Four 

"The Big Four" by Agatha Christie is a thrilling detective novel featuring the renowned Belgian detective Hercule Poirot. In this enthralling mystery, Poirot takes on a clandestine criminal organisation known as "The Big Four, " whose sinister plans threaten world peace. As he navigates through complex puzzles and dangerous adversaries, Poirot employs his sharp intellect and keen observation skills to uncover the truth behind the conspiracy. With Christie's trademark plot twists and suspenseful storytelling, "The Big Four" keeps readers on the edge of their seats until the final revelation.