The Queen of Mystery has come to Harper Collins‎!‎ Agatha Christie‎,‎ the acknowledged mistress of suspense—creator of indomitable sleuth Miss Marple‎,‎ meticulous Belgian detective Hercule Poirot‎,‎ and so many other unforgettable characters—brings her entire oeuvre of ingenious whodunits‎,‎ locked room mysteries‎,‎ and perplexing puzzles to Harper Paperbacks‎.‎ In her classic The Big Four‎,‎ the great Poirot is caught up in a deadly game of international intrigue as he races to uncover the strange mystery of “Number Four‎.‎”