Famed for her crime masterpieces, Agatha Christie's books have become the best-selling in the world, appealing to readers young and old for their ingenious plots and immediately recognizable characters. The stories have also transcended the printed page, become bestselling audiobooks and award-winning films, plays and television series. Now words and pictures combine in an exciting new way of telling these stories - full-colour graphic novels which enhance the original stories and offer a completely new way of enjoying some of the world's most popular and exciting mysteries.Framed in the doorway of Poirot's bedroom stands an uninvited guest, coated from head to foot in dust. The man's gaunt face stares for a moment, then he sways and falls.Who is he? Is he suffering from shock or just exhaustion? Above all, what is the significance of the figure 4, scribbled over and over again on a sheet of paper? Poirot finds himself plunged into a world of international intrigue, risking his life to uncover the truth about 'Number Four'.