Brother Cadfael 03: Monk's Hood

this time, he must have left them in the great court or at the gatehouse.
    "You may yet be able to help us, brother," he said as Cadfael entered. "It would be a gain to know from which supply of this oil of yours the poison was taken, but the young brother here can't say if any is missing from this store. Can you be more forthcoming?"
    "On that point," said Cadfael bluntly, "no. The amount needed would be very small, and my stock, as you see, is large. No one could pretend to say with certainty whether any had been taken out unlawfully. This I can tell you, I examined the neck and stopper of this bottle yesterday, and there is no trace of oil at the lip. I doubt if a thief in haste would stop to wipe the lip clean before stoppering it, as I do."
    The sergeant nodded, partially satisfied that this accorded with what he believed. "It's more likely it was taken from the infirmary, then. And that's a smaller flask by much than this, but I've been there, and they can none of them hazard an opinion. Among the old the oil is in favoured use now, who can guess if it was used one more time without lawful reason?"
    "You've made little progress, I fear," said Brother Cadfael.
    "We have not caught our man, yet. No knowing where Edwin Gurney is hiding, but there's been no trace of him round Bellecote's shop, and the carpenter's horse is in its stable. I'd wager the boy is still somewhere within the town. We're watching the shop and the gates, and keeping an eye on his mother's house. It is but a matter of time before we take him."
    Cadfael sat back on his bench and spread his hands on his knees. "You're very sure of him. Yet there are at least four others who were there in the house, and any number more who, for one reason or another, know the use and abuse of this preparation. Oh, I know the weight of the case you can make against this boy. I could make as good a case against one or two more, but that I won't do. I'd rather by far consider those factors that might provide, not suspicion, but proof, and not against one chosen quarry, but against the person, whoever he may be, towards whom the facts point. The time concerned is tight, half an hour at most. I myself saw the manservant fetch the dishes from the abbot's kitchen, and carry them out at the gate. Unless we are to look seriously at those who serve the abbot's kitchen, the dish was still harmless when it left our enclave. I don't say," he added blandly, "that you should, because we wear the cowl, write off any man of us as exempt from suspicion, myself included."
    The sergeant was intelligent, though not impressed. "Then what limiting factors, what firm facts, do you refer to, brother?"
    "I mentioned to you yesterday, and if you care to sniff at that bottle, and try a drop of it on your sleeve, you'll note for yourself, that it makes itself apparent both to the nose and eye. You would not easily wash out the greasy mark from cloth, nor get rid of the smell. It is not the wolfsbane that smells so sharp and acrid, there's also mustard and other herbs. Whoever you seize upon, you must examine his clothing for these signs. I don't say it's proof of innocence if no such signs are found, but it does weaken the evidence of guilt."
    "You are interesting, brother," said the sergeant, "but not convincing."
    "Then consider this. Whoever had used that poison would be in haste to get rid of the bottle as soon as possible, and as cleanly. If he lingered, he would have to hide it about him, and risk marking himself, or even having it discovered on him. You will conduct your business as you see fit. But I, were I in your shoes, would be looking very carefully for a small vial, anywhere within a modest distance of that house, for when you find it, the place where it was discarded will tell a great deal about the person who could have cast it there." And with certainty he added: "You'll be in no doubt of it being the right vial."
    He did not at all like the expression of indulgent complacency that was creeping over the sergeant's weathered countenance, as though he enjoyed a joke that presently, when he chose to divulge it, would quite take the wind out of Cadfael's sails. He himself admitted he had not captured his man, but there was certainly some other secret satisfaction he was hugging to his leather bosom.
    "You have not found it already?" said Cadfael cautiously.
    "Not found it, no. Nor looked for it very hard. But for all that, I know where it is. Small use looking now, and in any