'If you will present yourself at the house in half an hour's time, I will have arranged some story to account for your presence. I had better represent you to be connected with journalism in some way. I shall say you have come from Paris, and that you have brought a card of introduction from M. de Saint Alard. Madame Déroulard is very feeble in health, and will pay little attention to details.'

On mademoiselle's ingenious pretext I was admitted to the house, and after a brief interview with the dead deputy's mother, who was a wonderfully imposing and aristocratic figure though obviously in failing health, I was made free of the premises.

I wonder, my friend (continued Poirot), whether you can possibly figure to yourself the difficulties of my task? Here was a man whose death had taken place three days previously. If there had been foul play, only one possibility was admittable - poison! And I had had no chance of seeing the body, and there was no possibility of examining, or analysing, any medium in which the poison could have been administered. There were no clues, false or otherwise, to consider. Had the man been poisoned? Had he died a natural death? I, Hercule Poirot, with nothing to help me, had to decide. First, I interviewed the domestics, and with their aid, I recapitulated the evening. I paid especial notice to the food at dinner, and the method of serving it. The soup had been served by M. Déroulard himself from a tureen. Next a dish of cutlets, then a chicken. Finally a compote of fruits. And all placed on the table, and served by Monsieur himself. The coffee was brought in a big pot to the dinner-table. Nothing there, mon ami - impossible to poison one without poisoning all!

After dinner Madame Déroulard had retired to her own apartments and Mademoiselle Virginie had accompanied her. The three men had adjourned to M. Déroulard's study. Here they had chatted amicably for some time, when suddenly, without any warning, the deputy had fallen heavily to the ground. M. de Saint Alard had rushed out and told François to fetch a doctor immediately. He said it was without doubt an apoplexy, explained the man. But when the doctor arrived, the patient was past help.

Mr John Wilson, to whom I was presented by Mademoiselle Virginie, was what was known in those days as a regular John Bull Englishman, middle-aged and burly. His account, delivered in very British French, was substantially the same.

'Déroulard went very red in the face, and down he fell.'

There was nothing further to be found out there. Next I went to the scene of the tragedy, the study, and was left alone there at my own request. So far there was nothing to support Mademoiselle Mesnard's theory. I could not but believe that it was a delusion on her part. Evidently she had entertained a romantic passion for the dead man which had not permitted her to take a normal view of the case. Nevertheless, I searched the study with meticulous care. It was just possible that a hypodermic needle might have been introduced into the dead man's chair in such a way as to allow of a fatal injection. The minute puncture it would cause was likely to remain unnoticed. But I could discover no sign to support that theory. I flung myself down in the chair with a gesture of despair.