The Big Four: A Hercule Poirot Mystery

Standing in Hercule Poirot’s bedroom doorway is an unexpected visitor covered in dust from head to toe. The man stares, then collapses. Who is he? Is he in shock or simply exhausted? And what does the repeated scribbling of the number 4 on a piece of paper mean? Poirot is thrust into a realm of global intrigue, risking everything to unveil the truth, including his own life and that of his twin brother.