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The maid mixed her a draught from a bottle of indigestion - powder, which consisted mainly of bicarbonate of soda and bismuth, and brought her a hot - water bottle, leaving her lying on the bed. Her description of her mistress's appearance tallied exactly with the porter's and taxi - man's description of Bendix, but unlike them she did not seem to have been alarmed by it. She admitted later to the opinion that Mrs. Bendix, though anything but a greedy woman, must have overeaten herself at lunch.

At a quarter past three there was a violent ring from the bell in Mrs. Bendix's room.

The girl hurried upstairs and found her mistress apparently in a cataleptic fit, unconscious and rigid. Thoroughly frightened now, she wasted some precious minutes in ineffectual attempts to bring her round, and then hurried downstairs to telephone for the doctor. The practitioner who regularly attended the house was not at home, and it was some time before the butler, who had found the half - hysterical girl at the telephone and taken matters into his own hands, could get into communication with another. By the time the latter did get there, nearly half - an - hour after Mrs. Bendix's bell had rung, she was past help. Coma had set in, and in spite of everything the doctor could do she died in less than ten minutes after his arrival.

She was, in fact, already dead when the butler telephoned to the Rainbow Club.

CHAPTER III

HAVING reached this stage in his narrative Moresby paused, for effect, breath and refreshment. So far, in spite of the eager interest with which the story had been followed, no fact had been brought out of which his listeners were unaware. It was the police investigations that they wanted to hear, for not only had no details of these been published but not so much as a hint had been given even as to the theory that was officially held.

Perhaps Moresby had gathered something of this sentiment, for after a moment's rest he resumed with a slight smile. "Well, ladies and gentlemen, I shan't keep you much longer with these preliminaries, but it's just as well to run through everything while we're on it, if we want to get a view of the case as a whole.

"As you know, then, Mr. Bendix himself did not die. Luckily for himself he had eaten only two of the chocolates, as against his wife's seven, but still more luckily he had fallen into the hands of a clever doctor. By the time her doctor saw Mrs. Bendix it was too late for him to do anything; but the smaller amount of poison that Mr. Bendix had swallowed meant that its progress was not so rapid, and the doctor had time to save him.

"Not that the doctor knew then what the poison was. He treated him chiefly for prussic acid poisoning, thinking from the symptoms and the smell that Mr. Bendix must have taken oil of bitter almonds, but he wasn't sure and threw in one or two other things as well. Anyhow, it turned out in the end that he couldn't have had a fatal dose, and he was conscious again by about eight o'clock that night. They'd put him into one of the club bedrooms, and by the next day he was convalescent."

At first, Moresby went on to explain, it was thought at Scotland Yard that Mrs. Bendix's death and her husband's narrow escape were due to a terrible accident. The police had, of course, taken the matter in hand as soon as the woman's death was reported to them and the fact of poison established. In due course a District Detective Inspector arrived at the Rainbow Club, and as soon as the doctor would permit after Bendix's recovery of consciousness held an interview with the still very sick man.

The fact of his wife's death was kept from him in his doubtful condition and he was questioned solely upon his own experience, for it was already clear that the two cases were bound up together and light on one would equally clarify the other. The Inspector told Bendix bluntly that he had been poisoned and pressed him as to how the stuff could have been taken: could he account for it in any way?

It was not long before the chocolates came into Bendix's mind. He mentioned their burning taste, and he mentioned having already spoken to Sir Eustace about them as the possible cause of his illness.

This the inspector already knew. He had spent the time before Bendix came round in interviewing such people as had come into contact with him since his return to the club that afternoon. He had heard the porter's story and he had taken steps to trace the taxi - man; he had spoken with the members who had gathered round Bendix in the lounge, and Sir Eustace had reported to him the remark of Bendix about the chocolates.

The inspector had not attached very much importance to this at the moment, but simply as a matter of routine had questioned Sir Eustace closely as to the whole episode and, again as a matter of routine, had afterwards rummaged through the waste - paper basket and extricated the wrapper and the covering - letter. Still as a matter of routine, and still not particularly impressed, he now proceeded to question Bendix on the same topic, and then at last began to realise its significance as he heard how the two had shared the chocolates after lunch and how, even before Bendix had left home, the wife had eaten more than the husband.

The doctor now intervened, and the inspector had to leave the sick - room. His first action was to telephone to his colleague at the Bendix home and tell him to take possession without delay of the box of chocolates which was probably still in the drawing - room; at the same time he asked for a rough idea of the number of chocolates that were missing. The other told him, nine or ten. The inspector, who on Bendix's information had only accounted for six or seven, rang off and telephoned what he had learnt to Scotland Yard.

Interest was now centred on the chocolates. They were taken to Scotland Yard that evening, and sent off at once to be analysed.

"Well, the doctor hadn't been far wrong," said Moresby. "The poison in those chocolates wasn't oil of bitter almonds as a matter of fact, it was nitro - benzene; but I understand that isn't so very different. If any of you ladies or gentlemen have a knowledge of chemicals, you'll know more about the stuff than I do, but I believe it's used occasionally in the cheaper sorts of confectionery (less than it used to be, though) to give an almond - flavour as a substitute for oil of bitter almonds, which I needn't tell you is a powerful poison too. But the most usual way of employing nitrobenzene commercially is in the manufacture of aniline dyes."

When the analyst's preliminary report came through Scotland Yard's initial theory of accidental death was strengthened. Here definitely was a poison used in the manufacture of chocolates and other sweets. A terrible mistake must have been made. The firm had been employing the stuff as a cheap substitute for genuine liqueurs and too much of it had been used. The fact that the only liqueurs named on the silver wrappings were Maraschino, Kummel and Kirsch, all of which carry a greater or lesser flavour of almonds, supported this conception.

But before the firm was approached by the police for an explanation, other facts had come to light. It was found that only the top layer of chocolates contained any poison. Those in the lower layer were completely free from anything harmful. Moreover in the lower layer the fillings inside the chocolate cases corresponded with the description on the wrappings, whereas in the top layer, besides the poison, each sweet contained a blend of the three liqueurs mentioned and not, for instance, plain Maraschino and poison. It was further remarked that no Maraschino, Kirsch or Kummel was to be found in the two lower layers.

The interesting fact also emerged, in the analyst's detailed report, that each chocolate in the top layer contained, in addition to its blend of the three liqueurs, exactly six minims of nitrobenzene, no more and no less. The cases were a fair size and there was plenty of room for quite a considerable quantity of the liqueur - blend besides this fixed quantity of poison. This was significant. Still more so was the further fact that in the bottom of each of the noxious chocolates there were distinct traces of a hole having been drilled in the case and subsequently plugged up with a piece of melted chocolate.