My study of poisons had been profoundly unproductive of suggestion. The vast majority of them were thrown aside as ridiculous. To use them would have been suicidal. Corrosives, for instance, with their obvious evidences, could never be employed except by the most thoughtless and ignorant. I even disliked reading about their symptoms. I would certainly as soon have dashed out the brains of my victim with a sledge-hammer.

True, there are, I believe, on record cases where poisoning by arsenic had passed undetected, but it was far too slow a medium; I might not always have sufficient time at my command. I studied the irritants with an equal feeling of dissatisfaction, and the neurotics filled me with a sense of the hopelessness of the task I had undertaken. I was firmly convinced that there must be a poison somewhere in which the chances of detection were infinitesimal. Copper, and the possibility of its being administered so that its presence in food might appear accidental, detained me some time and cost me a great deal of thought, but how to manage it was not very apparent. At any rate, I mentally registered the idea; I was determined that on no account would I commit anything to paper. I have at all times considered the carelessness of criminals in this respect most curious. I reflected that it would be an excellent thing to devote so much time every evening to a retrospect of the day’s work and if possible to destroy all evidences as I went along.

My sinister resolution had been taken so imperceptibly that I found myself engrossed with the details before I was quite aware of how far I had travelled in the matter.

About this time I picked up a book on reincarnation, and I began to wonder if after all I might not be Ethel, Lord Gascoyne, come again. In default of being able to prove the contrary I came to the conclusion that I was. The fancy pleased me and I would indulge it.

In my search for a good medium I was confronted with the fact that the secrets of the best poisoners have died with them. Confession does not recommend itself to the strongest intellects even when in extremis. Now and then of course the vanity of a great artist has led to inconvenient death-bed boasting, as in the case of Philippe Darville, who, imagining himself about to die, gave an exhaustive and circumstantial account of his crimes, and recovering, was brought to the block, only his sense of humour supporting him through the trying development.

I continued my search for the medium I wanted, and in the meanwhile made myself thoroughly acquainted with the habits of young Gascoyne Gascoyne.

In appearance he was tall and athletic, and his character seemed to be that of most young men about town with natural instincts and without too much imagination. He patronised the lighter forms of theatrical entertainment, and I recognised him as having been one of the habitués of the Frivolity Theatre. Further inquiry elicited the fact that he was being assisted to sow his wild oats by a young lady of the chorus with a snub nose and with that in her which can only be described as “devil.” She appeared to be genuinely in love with him and had proved it by declining to allow him to marry her—an offer he had made in the first days of their acquaintance. He was busily employed in the City all day, and, being an only son, his parents seemed to expect more attention from him than would otherwise have been the case. The house they lived in had gardens at the back which opened on to a quiet road. Having no very clear conception as to how I was going to act I derived a certain satisfaction from hanging about this road, and was surprised one night by almost running up against young Gascoyne Gascoyne as he emerged from a private gate which he locked behind him with a pass-key. I watched him walk swiftly into the thoroughfare, hail a cab and drive away. It was barely eleven o’clock, and when I returned and looked at the house all the lights in the lower windows were out. That, however, in what I had by observation gathered to be his bedroom was alight. Evidently he was not sufficiently emancipated from parental control to go his own way openly, or his secrecy was due to consideration for his parents’ feelings.

I ascertained that as a rule when he spent the evening at home he left the house as soon as his parents were in bed, and if in time called at the theatre and drove his infatuation home. Sometimes he did not return to South Kensington till daybreak. It seemed such a daring proceeding that at times I wondered if his father might not be cognisant of it. The girl’s name was Kate Falconer. I don’t suppose it was her real name, but as such she figured with a couple of dozen others at the bottom of the play bill.

Since her attachment to young Gascoyne she had dispensed with the attentions of all her other admirers. I was sorry for her, as it meant that she was wasting time. She lived in a flat in Bloomsbury, three floors up, and once her front door was shut she was as secure from any observation as if she had been living in the moon.

The problem was a difficult one. It was essential that I should not be acquainted with either of them. Put brutally, the task I had set myself was how to poison a man to whom I was a perfect stranger, and to whose food-supply I had absolutely no means of access.