"She learned it from me just two days before her death. And you understand, there was no grief with it. My aunt had suffered terribly in the last few months. Angina pectoris, very painful. We were quite glad to see her suffering at an end."
Flamborough felt that this fresh piece of information needed consideration before he ventured on to the ground which had been disclosed.
"Are you staying in Westerhaven, Mr. Renard?" he inquired.
"Yes, for a few days yet, I expect," the little man answered. "I have some legal matters in my hands which need my presence on the spot. As my sister is now dead, there is the disposal of this money to be considered. I find difficulties which I had not expected."
"And your address during your stay will be?"
"I am at the Imperial Hotel. You can always find me there."
"Well, Mr. Renard, I’d like to have a talk with you later on, if I may. Just at present, I’m very busy. Perhaps you could spare a few minutes when my hands are free."
"I shall be delighted," Renard acquiesced. "Whenever you wish to see me, send a message. I am much worried, you understand?" he concluded, with a quiver in his voice which pierced through the official coating of Flamborough and touched the softer material inside.
For the next day or two, Sir Clinton’s interest in the Hassendean case appeared to have faded out; and Inspector Flamborough, after following up one or two clues which eventually proved useless, was beginning to feel perturbed by the lack of direct progress which the investigation showed. Rather to his relief, one morning the Chief Constable summoned him to his office. Flamborough began a somewhat apologetic account of his fruitless investigations; but Sir Clinton cut him short with a word or two of appreciation of his zeal.
"Here’s something more definite for you to go on," he suggested. "I’ve just had a preliminary report from the London man whom we put on to search for the poison. I asked him to let me have a private opinion at the earliest possible moment. His official report will come in later, of course."
"Has he spotted it, sir?" the Inspector inquired eagerly.
"He’s reached the same conclusion as I did—and as I suppose you did also," Sir Clinton assured him.
Flamborough looked puzzled.
"I didn’t spot it myself," he confessed diffidently. "In fact, I don’t see how there was anything to show definitely what stuff it was, barring dilatation of the eye-pupils, and that might have been due to various drugs."
"You should never lose an opportunity of exercising your powers of inference, Inspector. I mustn’t rob you of this one. Now put together two things: the episode of the mixed melting-point and the phrase about his ‘triumph’ that young Hassendean wrote in his journal. Add the state of the girl’s pupils as a third point—and there you are!"
Flamborough pondered for a while over this assortment of information, but finally shook his head.
"I don’t see it yet, sir."
"In that case," Sir Clinton declared, with the air of one bestowing benevolence, "I think we’d better let it dawn on you slowly. You might be angry with yourself if you realised all of a sudden how simple it is."
He rose to his feet as he spoke.
"I think we’ll pay a visit to the Croft-Thornton Institute now, and see how Markfield has been getting along with his examination. We may as well have a check, before we begin to speculate too freely."
They found Markfield in his laboratory, and Sir Clinton came to business at once.
"We came over to see how you were getting on with that poison business, Dr. Markfield. Can you give us any news?"
Markfield indicated a notebook on his desk.
"I’ve got it out, I think. It’s all there; but I haven’t had time to write a proper report on it yet. It was——"
"Hyoscine?" Sir Clinton interrupted.
Markfield stared at him with evident appreciation.
"You’re quite right," he confirmed, with some surprise. "I suppose you’ve got private information."
The Chief Constable evaded the point.
"I’m asking this question only for our own information; you won’t be asked to swear to it in court. What amount of hysocine do you think was in the body, altogether? I mean, judging from the results you obtained yourself."
Markfield considered for a moment.
"I’m giving you a guess, but I think it’s fairly near the mark. I wouldn’t, of course, take my oath on it. But the very smallest quantity, judging from my results, would be somewhere in the neighbourhood of seven or eight milligrammes."
"Have you looked up anything about the stuff—maximum dose, and so forth?" Sir Clinton inquired.
"The maximum dose of hyoscine hydrobromide is down in the books as six-tenths of a milligramme—about a hundredth of a grain in apothecaries’ weights."
"Then she must have swallowed ten or twelve times the maximum dose," Sir Clinton calculated, after a moment or two of mental arithmetic.
He paused for a space, then turned again to Markfield.
"I’d like to see the hyoscine in your store here, if you can lay your hands on it easily."
