Agatha Christie 
The Big Four [EPUB ebook] 

"The Big Four" is a gripping detective novel by Agatha Christie, featuring the brilliant Belgian detective Hercule Poirot. In this thrilling tale, Poirot finds himself facing off against a formidable adversary known only as "The Big Four." As Poirot investigates a series of interconnected crimes, he uncovers a sinister plot involving international espionage, political intrigue, and high-stakes power struggles. With danger lurking at every turn, Poirot must use all his cunning and intellect to unravel the mystery and outwit his cunning adversaries. Filled with twists, turns, and unexpected revelations, "The Big Four" is a classic Christie mystery that will keep readers guessing until the very end.