The Big Four - Agatha Christie

Framed in the doorframe of Poirot's bedroom stood an unexpected guest, covered from head to toe in dust. The man stared at his thin, pained face for a moment, then staggered and fell to the ground.

Who was this man? Was he in shock or was it just stress? But most of all: What was meant by the number 4 that was scrawled in bad handwriting all over the page over and over again?!

Many events await Poirot