"She told nothing of herself?" asked Kennedy.
"No; she was pretty far gone when the cabby answered her signal. All he could get out of her was a word that sounded like 'Curio- curio.' He says she seemed to complain of something about her mouth and head. Her face was drawn and shrunken; her hands were cold and clammy, and then convulsions came on. He called an ambulance, but she was past saving when it arrived. The numbness seemed to have extended over all her body; swallowing was impossible; there was entire loss of her voice as well as sight, and death took place by syncope."
"Have you any clue to the cause of her death?" asked Craig.
"Well, it might have been some trouble with her heart, I suppose," remarked Doctor Leslie tentatively.
"Oh, she looks strong that way. No, hardly anything organic."
"Well, then I thought she looked like a Mexican," went on Doctor Leslie. "It might be some new tropical disease. I confess I don't know. The fact is," he added, lowering his voice, "I had my own theory about it until a few moments ago. That was why I called you."
"What do you mean?" asked Craig, evidently bent on testing his own theory by the other's ignorance.
Doctor Leslie made no answer immediately, but raised the sheet which covered her body and disclosed, in the fleshy part of the upper arm, a curious little red swollen mark with a couple of drops of darkened blood.
"I thought at first," he added, "that we had at last a genuine 'poisoned needle' case. You see, that looked like it. But I have made all the tests for curare and strychnin without results."
At the mere suggestion, a procession of hypodermic-needle and white-slavery stories flashed before me.
"But," objected Kennedy, "clearly this was not a case of kidnaping. It is a case of murder. Have you tested for the ordinary poisons?"
Doctor Leslie shook his head. "There was no poison," he said, "absolutely none that any of our tests could discover."
Kennedy bent over and squeezed out a few drops of liquid from the wound on a microscope slide, and covered them.
"You have not identified her yet," he added, looking up. "I think you will find, Leslie, that there is a Senora Herreria registered at the Prince Henry who is missing, and that this woman will agree with the description of her. Anyhow, I wish you would look it up and let me know."
Half an hour later, Kennedy was preparing to continue his studies with the microscope when Doctor Bernardo entered. He seemed most solicitous to know what progress was being made on the case, and, although Kennedy did not tell much, still he did not discourage conversation on the subject.
When we came in the night before, Craig had unwrapped and tossed down the Japanese sword and the Ainu bow and arrow on a table, and it was not long before they attracted Bernardo's attention.
"I see you are a collector yourself," he ventured, picking them up.
"Yes," answered Craig, offhand; "I picked them up yesterday at Sato's. You know the place?"
"Oh, yes, I know Sato," answered the curator, seemingly without the slightest hesitation. "He has been in Mexico--is quite a student."
"And the other man, Otaka?"
"Other man--Otaka? You mean his wife?"
I saw Kennedy check a motion of surprise and came to the rescue with the natural question: "His wife--with a beard and mustache?"
It was Bernardo's turn to be surprised. He looked at me a moment, then saw that I meant it, and suddenly his face lighted up.
"Oh," he exclaimed, "that must have been on account of the immigration laws or something of the sort. Otaka is his wife. The Ainus are much sought after by the Japanese as wives. The women, you know, have a custom of tattooing mustaches on themselves. It is hideous, but they think it is beautiful."
"I know," I pursued, watching Kennedy's interest in our conversation, "but this was not tattooed."
"Well, then, it must have been false," insisted Bernardo.
The curator chatted a few moments, during which I expected Kennedy to lead the conversation around to Senora Herreria. But he did not, evidently fearing to show his hand.
"What did you make of it?" I asked, when he had gone. "Is he trying to hide something?"
"I think he has simplified the case," remarked Craig, leaning back, his hands behind his head, gazing up at the ceiling. "Hello, here's Leslie! What did you find, Doctor?" The coroner had entered with a look of awe on his face, as if Kennedy had directed him by some sort of necromancy.
"It was Senora Herreria!" he exclaimed. "She has been missing from the hotel ever since late yesterday afternoon. What do you think of it?"
"I think," replied Kennedy, speaking slowly and deliberately, "that it is very much like the Northrop case. You haven't taken that up yet?"
"Only superficially. What do you make of it?" asked the coroner.
"I had an idea that it might be aconitin poisoning," he said.
Leslie glanced at him keenly for a moment. "Then you'll never prove anything in the laboratory," he said.
"There are more ways of catching a criminal, Leslie," put in Craig, "than are set down in the medico-legal text-books. I shall depend on you and Jameson to gather together a rather cosmopolitan crowd here to-night."
He said it with a quiet confidence which I could not gainsay, although I did not understand. However, mostly with the official aid of Doctor Leslie, I followed out his instructions, and it was indeed a strange party that assembled that night. There were Doctor Bernardo; Sato, the curio dealer; Otaka, the Ainu, and ourselves. Mrs. Northrop, of course, could not come.
"Mexico," began Craig, after he had said a few words explaining why he had brought us together, "is full of historical treasure. To all intents and purposes, the government says, 'Come and dig.' But when there are finds, then the government swoops down on them for its own national museum. The finder scarcely gets a chance to export them. However, now seemed to be the time to Professor Northrop to smuggle his finds out of the country.
"But evidently it could not be done without exciting all kinds of rumors and suspicions. Stories seem to have spread far and fast about what he had discovered. He realized the unsettled condition of the country--perhaps wanted to confirm his reading of a certain inscription by consultation with one scholar whom he thought he could trust. At any rate, he came home."
Kennedy paused, making use of the silence for emphasis. "You have all read of the wealth that Cortez found in Mexico. Where are the gold and silver of the conquistadores? Gone to the melting pot, centuries ago. But is there none left? The Indians believe so. There are persons who would stop at nothing--even at murder of American professors, murder of their own comrades, to get at the secret."
He laid his hand almost lovingly on his powerful little microscope as he resumed on another line of evidence.
"And while we are on the subject of murders, two very similar deaths have occurred," he went on. "It is of no use to try to gloss them over. Frankly, I suspected that they might have been caused by aconite poisoning. But, in the case of such poisoning, not only is the lethal dose very small but our chemical methods of detection are nil. The dose of the active principle, aconitin nitrate, is about one six-hundredth of a grain. There are no color tests, no reactions, as in the case of the other organic poisons."
I wondered what he was driving at. Was there, indeed, no test? Had the murderer used the safest of poisons--one that left no clue? I looked covertly at Sato's face. It was impassive. Doctor Bernardo was visibly uneasy as Kennedy proceeded. Cool enough up to the time of the mention of the treasure, I fancied, now, that he was growing more