For some time the air had been heavy with an impending storm. Now the thunder rolled, booming among the peaks above us. When its echoings and reechoings had almost died away, something answered them. I cannot describe that voice; it was not quite a human shout, nor was it the mere bellow of a beast.

All her weariness left the woman Casdoe, replaced by the most desperate haste. Heavy wooden shutters stood against the wall beneath each of the narrow windows; she seized the nearest, and lifting it as if it weighed no more than a pie pan sent it crashing into place. Outside, the dog barked frantically then fell silent, leaving no sound but the pattering of the first rain.

“So soon,” Casdoe cried. “So soon!” To her son: “Severian, get out of the way.”

Through one of the still open windows, I heard a child’s voice call, “Father, can’t you help me?”

I TRIED TO assist Casdoe, and in the process turned my back on Agia and her dagger. It was an error that almost cost me my life, for she was upon me as soon as I was encumbered with a shutter. Women and tailors hold the blade beneath the hand, according to the proverb, but Agia stabbed up to open the tripes and catch the heart from below, like an accomplished assassin. I turned only just in time to block her blade with the shutter, and the point drove through the wood to show a glint of steel.

The very strength of her blow betrayed her. I wrenched the shutter to one side and threw it across the room, and her knife with it. She and Casdoe both leaped for it. I caught Agia by an arm and jerked her back, and Casdoe slammed the shutter into place with the knife out, toward the gathering storm.

“You fool,” Agia said. “Don’t you realize you’re giving a weapon to whomever it is you’re afraid of?” Her voice was calm with defeat.

“It has no need of knives,” Casdoe told her.

The house was dark now except for the ruddy light of the fire. I looked around for candles or lanterns, but there were none in sight; later I learned that the few the family owned had been carried to the loft. Lightning flashed outside, outlining the edges of the shutters and making a broken line of stark light at the bottom of the door — it was a moment before I realized that it had been a broken line, when it should have been a continuous one. “There’s someone outside,” I said. “Standing on the step.”

Casdoe nodded. “I closed the window just in time. It has never come so early before. It may be that the storm wakened it.”

“You don’t think it might be your husband?”

Before she could answer me, a voice higher than the little boy’s called, “Let me in, Mother.”

Even I, who did not know what it was that spoke, sensed a fearful wrongness in the simple words. It was a child’s voice, perhaps, but not a human child’s.

“Mother,” the voice called again. “It is beginning to rain.”

“We had better go up,” Casdoe said. “If we pull the ladder after us, it cannot reach us even if it should get inside.”

I had gone to the door. Without lightning, the feet of whatever it was that stood on the doorstep were invisible; but I could hear a hoarse, slow breathing above the beating of the rain, and once a scraping sound, as though the thing that waited there in the dark had shifted its footing.

“Is this your doing?” I asked Agia. “Some creature of Hethor’s?”

She shook her head; the narrow, brown eyes were dancing. “They roam wild in these mountains, as you should know much better than I.”

“Mother?”

There was a shuffle of feet — with that fretful question, the thing outside had turned from the door. One of the shutters was cracked, and I tried to look through the slit; I could see nothing in the blackness outside, but I heard a soft, heavy tread, precisely the sound that sometimes came through the barred ports of the Tower of the Bear at home.

“It took Severa three days ago,” Casdoe said. She was trying to get the old man to rise; he did so slowly, reluctant to leave the warmth of the fire. “I never let her or Severian go among the trees, but it came into the clearing here, a watch before twilight. Since then it has returned every night. The dog wouldn’t track it, but Becan went to hunt it today.”

I had guessed the beast’s identity by that time, though I had never beheld one of its kind. I said, “It is an alzabo, then? The creature from whose glands the analept is made?”

“It is an alzabo, yes,” Casdoe answered. “I know nothing of any analept.”

Agia laughed. “But Severian does. He has tasted the creature’s wisdom, and carries his beloved about within himself. I understand one hears them whispering together by night, in the very heat and sweat of love.”

I struck at her; but she dodged nimbly, then put the table between herself and me. “Aren’t you delighted, Severian, that when the animals came to Urth to replace all those our ancestors slew, the alzabo was among them? Without the alzabo, you would have lost your dearest Thecla forever. Tell Casdoe here how happy the alzabo has made you.”

To Casdoe I said, “I am truly sorry to hear of your daughter’s death. I will defend this house from the animal outside, if it must be done.”

My sword was standing against the wall, and to show that my will was as good as my words, I reached for it. It was fortunate I did so, for just at that instant a man’s voice at the door called, “Open, darling!”

Agia and I sprang to stop Casdoe, but neither of us was swift enough. Before we could reach her, she had lifted the bar. The door swung back.

The beast that waited there stood upon four legs; even so, its hulking shoulders were as high as my head. Its own head was carried low, with the tips of its ears below the crest of fur that topped its back. In the firelight, its teeth gleamed white and its eyes glowed red. I have seen the eyes of many of these creatures that are supposed to have come from beyond the margin of the world — drawn, as certain philonoists allege, by the death of those whose genesis was here, even as tribes of enchors come slouching with their stone knives and fires into a countryside depopulated by war or disease; but their eyes are the eyes of beasts only. The red orbs of the alzabo were something more, holding neither the intelligence of humankind nor the innocence of the brutes. So a fiend might look, I thought, when it had at last struggled up from the pit of some dark star; then I recalled the man-apes, who were indeed called fiends, yet had the eyes of men.

For a moment it seemed the door might be shut again. I saw Casdoe, who had recoiled in horror, try to swing it to. The alzabo appeared to advance slowly and even lazily, yet it was too swift for her, and the edge of the door struck its ribs as it might have struck a stone.

“Let it stay open,” I called. “We’ll need whatever light there is.” I had unsheathed Terminus Est, so that her blade caught the firelight and seemed itself a bitter fire. An arbalest like the ones Agia’s henchmen had carried, whose quarrels are ignited by the friction of the atmosphere and burst when they strike like stones cast into a furnace, would have been a better weapon; but it would not have seemed an extension of my arm as Terminus Est did, and perhaps after all an arbalest would have permitted the alzabo to spring on me while I sought to recock it, if the first quarrel missed.

The long blade of my sword did not wholly obviate that danger. Her square, unpointed tip could not impale the beast, should it spring. I would have to slash at it in air, and though I had no doubt that I could strike the head from that thick neck while it flew toward me, I knew that to miss would be death. Furthermore, I needed space enough to make the stroke, for which that narrow room was scarcely adequate; and though the fire was dying, I needed light.