‘No one will ever know who the guilty person is…’
 
 He added softly:
 
 ‘Unless you already know, madame?’
 
 She cried out:
 
 ‘You have no business to say that! It’s not true! Oh! If only it could be a stranger—not a member of the family.’
 
 Poirot said:
 
 ‘It might be both.’
 
 She stared at him.
 
 ‘What do you mean?’
 
 ‘It might be a member of the family—and, at the same time, a stranger…You do not see what I mean? Eh bien, it is an idea that has occurred to the mind of Hercule Poirot.’
 
 He looked at her.
 
 ‘Well, madame, what am I to say to Mr Lee?’
 
 Lydia raised her hands and let them fall in a sudden helpless gesture.
 
 She said:
 
 ‘Of course—you must accept.’
 
 IV
 
 Pilar stood in the centre of the music-room. She stood very straight, her eyes darting from side to side like an animal who fears an attack.
 
 She said:
 
 ‘I want to get away from here!’
 
 Stephen Farr said gently:
 
 ‘You’re not the only one who feels like that. But they won’t let us go, my dear.’
 
 ‘You mean—the police?’
 
 ‘Yes.’
 
 Pilar said very seriously:
 
 ‘It is not nice to be mixed up with the police. It is a thing that should not happen to respectable people.’
 
 Stephen said with a faint smile:
 
 ‘Meaning yourself?’
 
 Pilar said:
 
 ‘No, I mean Alfred and Lydia and David and George and Hilda and—yes—Magdalene too.’
 
 Stephen lit a cigarette. He puffed at it for a moment or two before saying: