Lennox Boynton said suddenly and pugnaciously: "Why? Why the devil should he bring you into this business?"
Poirot waved a hand gracefully.
"Me, I am often called in cases of sudden death."
Lennox Boynton said: "Doctors send for you whenever there is a case of heart failure?"
Poirot said gently: "Heart failure is such a very loose and unscientific term."
Colonel Carbury cleared his throat. It was an official noise. He spoke in an official tone:
"Best to make it quite clear.
Circumstances of death reported to me.
Very natural occurrence. Weather unusually hot. Journey a very trying one for an elderly lady in bad health. So far all quite clear.
But Dr. Gerard came to me and volunteered a statement - " He looked inquiringly at Poirot. Poirot nodded.
"Dr. Gerard is a very eminent physician with a worldwide reputation. Any statement he makes is bound to be received with attention.
Dr. Gerard's statement was as follows: On the morning after Mrs. Boynton's death, he noticed that a certain quantity of a powerful drug acting on the heart was missing from his medical supplies.
On the previous afternoon he had noted the disappearance of a hypodermic syringe. Syringe was returned during the night.
Final point - there was a puncture on the dead woman's wrist corresponding to the mark of a hypodermic syringe." Colonel Carbury paused. "In these circumstances I considered that it was the duty of those in authority to inquire into the matter.
M. Hercule Poirot was my guest and very considerately offered his highly specialized services.
I gave him full authority to make any investigations he pleased.
We are assembled here now to hear his report on the matter."
There was silence. A silence so acute that you could have heard - as the saying is - a pin drop.
Actually, somebody in the next room did drop what was probably a shoe. It sounded like a bomb in the hushed atmosphere.
Poirot cast a quick glance at the little group of three people on his right, then turned his gaze to the five people huddled together on his left - a group of people with frightened eyes.
Poirot said quietly: "When Colonel Carbury mentioned this business to me, I gave him my opinion as an expert.
I told him that it might not be possible to bring proof - such proof as would be admissible in a court of law - but I told him very definitely that I was sure I could arrive at the truth simply by questioning the people concerned.
For let me tell you this, my friends, to investigate a crime it is only necessary to let the guilty party or parties talk. Always, in the end, they tell you what you want to know!"
He paused. "So, in this case, although you have lied to me, you have also, unwittingly, told me the truth."
He heard a faint sigh, the scrape of a chair on the floor to his right, but he did not look around.
He continued to look at the Boyntons.
"First, I examined the possibility of Mrs. Boynton's having died a natural death - and I decided against it.
The missing drug, the hypodermic syringe, and above all, the attitude of the dead lady's family all convinced me that that supposition could not be entertained.
Not only was Mrs. Boynton killed in cold blood - but every member of her family was aware of the fact!
Collectively they reacted as guilty parties."
"But there are degrees in guilt.
I examined the evidence carefully with a view to ascertaining whether the murder - yes, it was murder! - had been committed by the old lady's family acting on a concerted plan.
There was, I may say, overwhelming motive.
One and all stood to gain by her death - both in the financial sense - for they would at once attain financial independence and indeed enjoy very considerable wealth - and also in the sense of being freed from what had become an almost insupportable tyranny."
"To continue: I decided, almost immediately, that the concerted theory would not hold water.
The stories of the Boynton family did not dovetail neatly into each other and no system of workable alibis had been arranged.
The facts seemed more to suggest that one - or possibly two members of the family had acted in collusion and that the others were accessories after the fact."
"I next considered which particular member or members were indicated. Here, I may say, I was inclined to be biased by a certain piece of evidence known only to myself."
Here Poirot recounted his experience in Jerusalem.
"Naturally, that pointed very strongly to M. Raymond Boynton as the prime mover in the affair.
Studying the family I came to the conclusion that the most likely recipient of his confidences that night would be his sister Carol.
They strongly resembled each other in appearance and temperament, and so would have a keen bond of sympathy and they also possessed the nervous rebellious temperament necessary for the conception of such an act.
That their motives were partly unselfish - to free the whole family and particularly their younger sister - only made the planning of the deed more plausible." Poirot paused a minute.
Raymond Boynton half opened his lips, then shut them again.
His eyes looked steadily at Poirot with a kind of dumb agony in them.
"Before I go into the case against Raymond Boynton, I would like to read to you a list of significant points which I drew up and submitted to Colonel Carbury this afternoon:
SIGNIFICANT POINTS
1.
Mrs. Boynton was taking a mixture containing digitalis.
2.