The book "Lord Edgware Dies" by Agatha Christie

The lifeless body of Lord Edgware, a wealthy man with an unusual and contradictory personality, is found in the library. Who would want the rich man's untimely death? Who benefits most from his sudden demise? World-famous Belgian detective Hercule Poirot faces a new challenge. Are all the suspects telling the truth? Or are some of them playing a role? How can you tell a real actor from a fake? The bet is on. All the actors are on stage. The curtain rises.