Free Heart's Blood by Juliet Marillier

becoming fair and sunny. He did not seem to notice them. As for me, I found it difficult to take my eyes from him.There was an odd beauty in his isolation and his sadness, like that of a forlorn prince ensorcelled by a wicked enchantress, or a traveler lost forever in a world far from home.
    I must stop being so fanciful. Less than a day here, and already I was inventing wild stories about the folk of the house.This was no enchanted prince, just an ill-tempered chieftain with no manners. If he’d been spying on me, that was his prerogative as my employer, I supposed; after all, I was on trial. I turned my attention back to the documents. The words on the page swirled and moved, and I rubbed my eyes, annoyed at my lack of concentration.
    I have applied myself assiduously to the great work of preparation. I keep the door locked.That does not stop the ignorant from seeking my attention with intrusive knocking. The child was sick—some minor malady, a cough, a slight fever. It was inappropriate to call me; trivial domestic matters are for others to deal with. It is for precisely this reason that our principal place of experimentation is situated beneath the floor level of the house, guarded by bolts and key, and by charms and wards to keep out marauders of a less earthly kind. The minds of ordinary folk cannot comprehend the nature of our work ...
    Something moved on the surface of the obsidian mirror. I glanced quickly, started with shock, stared deep, the hair standing up on my neck. Surely not ... but there it was. Within the dark stone was the image of a man standing in an underground chamber, a long, shadowy place lined with shelves on which stood crucibles, flasks, jars of powders and mixtures, books ... so many books in one place, their covers stained and worn as if from long and frequent handling. Anluan . . . No, this man was much older. In the uneven light from candles set around the chamber, his features became those of a carven saint: the eyes deep and penetrating; the mouth thin-lipped, disciplined; the bones of cheeks and jaw jutting beneath the pale skin.With long-fingered, dexterous hands he sorted implements on the bench before him, knives with odd-shaped blades, pincers, screws, other things whose uses I could only guess at. This one. He selected a gleaming instrument like a miniature scythe. I’ll get my answer from the old hag with this one.
    A chill ran through me. I shut my eyes, opened them again in disbelief, my gaze moving between the lines of black script and the gleaming surface of the dark mirror. What was this? I could see the work chamber of the document as if I were standing right there opposite the writer. I could see his long, ascetic face as he pondered the dilemma facing him. And I knew his thoughts; knew them and felt the edge of a terrible darkness touching my mind. How could this be? I was here, in the library by full daylight, and yet I was in that underground place, my hands feeling the touch of cold metal as the man took up his blade; my mind knowing his evil purpose. The mirror ... the mirror held the memory of time past, and as my eyes fell on it once more I felt the man’s presence as if he and I were one. Now there was no looking away.
     
    The old woman lies on the table, grimly silent. He’d been confident of achieving success before Aislinn got back with the herbs, but the crone is holding out beyond all expectations. She knows, of course. Of all the local women who dabble in a little white magic, this one has the reputation as the most experienced, the one who will understand without a doubt exactly what is meant in the grimoire by potent powders of summoning . But this wrinkled ancient with her parchment skin and her crooked fingers isn’t giving the secret up easily. Perhaps she is so old she no longer fears death; she may be using what arts she has to dull the pain. She’s already endured techniques that would make grown men soil themselves.
    He’s conducted such