that would be too much of a coincidence.'
'It depends how you look at it, Hastings. Regarded from one angle it would be no coincidence at all.'
'But why should Carlotta Adams wish to kill Lord Edgware? She did not even know him.'
'How do you know she did not know him? Do not assume things, Hastings. There may have been some link between them of which we know nothing. Not that that is precisely my theory.'
'Then you have a theory?'
'Yes. The possibility of Carlotta Adams being involved struck me from the beginning.'
'But, Poirot - '
'Wait, Hastings. Let me put together a few facts for you. Lady Edgware, with a complete lack of reticence, discusses the relations between her and her husband, and even goes so far as to talk of killing him. Not only you and I hear this. A waiter hears it, her maid probably has heard it many times, Bryan Martin hears it, and I imagine Carlotta Adams herself hears it. And there are the people to whom these people repeat it. Then, in that same evening, the excellence of Carlotta Adams' imitation of Jane is commented upon. Who had a motive for killing Lord Edgware? His wife.
'Now supposing that someone else wishes to do away with Lord Edgware. Here is a scapegoat ready to his hand. On the day when Jane Wilkinson announced that she had a headache and is going to have a quiet evening - the plan is put into operation.
'Lady Edgware must be seen to enter the house in Regent Gate. Well, she is seen. She even goes so far as to announce her identity. Ah! c'est peu trop, ça! It would awaken suspicion in an oyster.
'And another point - a small point, I admit. The woman who came to the house last night wore black. Jane Wilkinson never wears black. We heard her say so. Let us assume, then, that the woman who came to the house last night was not Jane Wilkinson - that it was a woman impersonating Jane Wilkinson. Did that woman kill Lord Edgware?
'Did a third person enter that house and kill Lord Edgware? If so, did the person enter before or after the supposed visit of Lady Edgware? If after, what did the woman say to Lord Edgware? How did she explain her presence? She might deceive the butler who did not know her, and the secretary who did not see her at close quarters. But she could not hope to deceive her husband. Or was there only a dead body in the room? Was Lord Edgware killed before she entered the house - sometime between nine and ten?'
'Stop, Poirot!' I cried. 'You are making my head spin.'
'No, no, my friend. We are only considering possibilities. It is like trying on the clothes. Does this fit! No, it wrinkles on the shoulder? This one? Yes, that is better - but not quite large enough. This other one is too small. So on and so on - until we reach the perfect fit - the truth.'
'Who do you suspect of such a fiendish plot?' I asked.
'Ah! that is too early to say. One must go into the question of who has a motive for wishing Lord Edgware dead. There is, of course, the nephew who inherits. A little obvious that, perhaps. And then in spite of Miss Carroll's dogmatic pronouncement, there is the question of enemies. Lord Edgware struck me as a man who very easily might make enemies.'
'Yes,' I agreed. 'That is so.'
'Whoever it was must have fancied himself pretty safe. Remember, Hastings, but for her change of mind at the last minute, Jane Wilkinson would have had no alibi. She might have been in her room at the Savoy, and it would have been difficult to prove it. She would have been arrested, tried - probably hanged.'
I shivered.
'But there is one thing that puzzles me,' went on Poirot. 'The desire to incriminate her is clear - but what then of the telephone call? Why did someone ring her up at Chiswick and, once satisfied of her presence there, immediately ring off. It looks, does it not, as if someone wanted to be sure of her presence there before proceeding to - what? That was at nine-thirty, almost certainly before the murder. The intention then seems - there is no other word for it - beneficent. It cannot be the murderer who rings up - the murderer has laid all his plans to incriminate Jane. Who, then, was it? It