"Later, I knew Helen in a great range of situations, including those we call ordinary life, and she never stopped surprising me. Often what astonished me in her were the quick associations her mind made between one fact and another, associations that usually resulted in an insight I would have been slow to reach myself. She dazzled me, too, with the wonderful breadth of her learning. Helen was full of these surprises, and I grew to consider them my daily fare, a pleasant addiction I developed to her ability to catch me off guard. But she never startled me more than at that moment in Istanbul, when she suddenly shot the librarian.

"I had no time for astonishment, however, because he stumbled sideways and hurled a book toward us, just missing my head. It hit a table somewhere to my left, and I heard it fall to the floor. Helen fired again, stepping forward and aiming with a steadiness that took my breath away. Then the oddness of the creature's reaction struck me. I'd never seen anyone shot before except in the movies, but there, alas, I had seen a thousand Indians die at gunpoint by the time I was eleven, and later every sort of crook, bank robber, and villain, including hosts of Nazis created expressly for shooting by an enthusiastic wartime Hollywood. The strange thing about this shooting, this real one, was that although a dark stain appeared on the librarian's clothes somewhere below his sternum, he did not clutch the spot with an agonized hand. The second shot grazed his shoulder; he was already running, and then he bolted into the stacks at the rear of the hall.

"'A door!' Turgut shouted behind me. 'There is a door there!' And we all ran after him, tripping on chairs and darting among the tables. Selim Aksoy, slight and fleet as an antelope, reached the shelves first and disappeared among them. We heard a scuffle and a crash, then indeed the slamming of a door, and found Mr. Aksoy stumbling up out of a drift of fragile Ottoman manuscripts with a purple lump on the side of his face. Turgut ran for the door and I ran after, but it was shut tightly. When we got it open, we discovered only an alley, deserted apart from a pile of wooden boxes. We searched the labyrinthine neighborhood at a trot, but there was no sign of the creature or his flight. Turgut collared a few pedestrians, but no one had seen our man.

"Reluctantly, we returned to the archive through the back door and found Helen holding her handkerchief to Mr. Aksoy's cheekbone. The gun was nowhere in sight, and the manuscripts were neatly stacked on the shelf again. She looked up when we came in. 'He fainted for a minute,' she said softly, 'but he is all right now.'

"Turgut knelt by his friend. 'My dear Selim, what a bump you have.'

"Selim Aksoy smiled wanly. 'I am in good care,' he said.

"'I can see that,' Turgut agreed. 'Madam, I congratulate you for trying. But it is useless to attempt to kill a dead man.'

"'How did you know?' I gasped.

"'Oh, I know,' he said grimly. 'I know the look of that face. It is the expression of the undead. There is no other face like that. I have seen it before.'

"'It was a silver bullet, of course.' Helen held the handkerchief more firmly on Mr. Aksoy's cheek and eased his head back against her shoulder. 'But, as you saw, he moved, and I missed his heart. I know I took a great risk' - she looked deeply at me for a moment, but I couldn't read her thoughts - 'but you could see for yourselves that I was right in my calculation. A mortal man would have been seriously wounded by such shots.' She sighed and adjusted the handkerchief.

"I looked from one to the other in bewilderment. 'Have you been carrying around that gun all the time?' I asked Helen.

"'Oh, yes.' She pulled Aksoy's arm over her shoulder. 'Here, help me get him up.' Together we lifted him - he was light as a child - and steadied him on his feet. He smiled and nodded, shrugging off our assistance. 'Yes, I always carry my pistol when I feel any sort of - uneasiness. And it is not so difficult to acquire a silver bullet or two.'

"'That is true.' Turgut nodded.

"'But where did you learn to shoot like that?' I was still stunned by that moment when Helen had drawn and aimed so quickly.

"Helen laughed. 'In my country, our education is deep as well as narrow,' she said. 'I received an award for my shooting in our youth brigade when I was sixteen. I am glad to find I have not forgotten how.'

"Suddenly Turgut gave a cry and struck his forehead. 'My friend!' We all stared. 'My friend - Erozan! I am forgetting him.'

"It took us only a second to grasp his meaning. Selim Aksoy, who seemed recovered now, was the first to hurry into the stacks where he'd received his injury, and the rest of us scattered quickly around the long room, searching under tables and behind chairs. For a few minutes the hunt was fruitless. Then we heard Selim calling us, and we all rushed to his side. He was kneeling in the stacks, at the foot of a high shelf laden with all kinds of boxes, bags, and rolled-up scrolls. The box that housed the papers of the Order of the Dragon lay on the floor beside him, its ornate lid open and some of its contents scattered nearby.

"Among these relics, Mr. Erozan was stretched out on his back, white and still, his head lolling to one side. Turgut knelt and put his ear to the man's chest. 'Thank God,' he said after a moment. 'He is breathing.' Then, examining him more closely, he pointed to his friend's neck. Deep in the loose, pale flesh just above the shirt collar, there was a ragged wound. Helen knelt beside Turgut. We were all silent for a moment. Even after Rossi's description of the bureaucrat who had confronted him many years before, even after Helen's injury in the library at home, I found it hard to believe what I was seeing. The man's face was terribly pale, almost gray, and his breathing came in shallow, short gasps, barely audible until you listened carefully.

"'He has been polluted,' Helen said quietly. 'And I think he has lost quite a bit of blood.'

"'A curse on this day!' Turgut's face was anguished, and he pressed his friend's hand in his two big ones.

"Helen was the first to rally. 'Let us think sensibly. This is perhaps only the first time he has been attacked.' She turned to Turgut. 'You didn't see any sign of this in him when we were here yesterday?'

"He shook his head. 'He was quite normal.'

"'Well, then.' She reached into her jacket pocket, and I recoiled for an instant, thinking she was about to pull out the pistol again. Instead she drew forth a head of garlic and placed it on the librarian's chest. Turgut smiled in spite of the grimness of the whole scene and drew a head of garlic from his own pocket, placing it with hers. I couldn't imagine where she'd gotten it - perhaps on our stroll through the souk, when I'd been absorbed in other sights? 'I see great minds think the same,' Helen told him. Then she took out a paper packet and unwrapped it, revealing a tiny silver crucifix. I recognized it as the one she'd purchased at the Catholic church near our university, the one she had used to intimidate the evil librarian when he'd attacked her in the history section of the library stacks.

"This time Turgut stopped her with a gentle hand. 'No, no,' he said. 'We have our own superstitions here.' From somewhere inside his jacket he took a string of wooden beads, such as I'd seen in the hands of men on the streets of Istanbul. This one ended in a carved medallion with Arabic lettering on its face. He touched the medallion gently to Mr. Erozan's lips, and the librarian's face gave a grimace, as of involuntary disgust, twitching and curling. It was an awful sight, but a momentary one, and then the man's eyes opened and he frowned. Turgut bent over him, speaking softly in Turkish and touching his forehead, then giving the wounded man a sip of something from a little flask he conjured out of his jacket.

"After a minute, Mr. Erozan sat up and looked around, groping at his neck as if it hurt. When his fingers found the little wound with its trickle of drying blood, he buried his face in his hands, sobbing, a heartrending sound.

"Turgut put an arm around his shoulders, and Helen placed a hand on the librarian's arm. I found myself reflecting that this was the second time in an hour that I had seen her tending with gentle touch to an afflicted being. Turgut began to question the man in Turkish, and after a few minutes he sat back on his heels and looked at the rest of us. 'Mr. Erozan says the stranger came to his apartment very early this morning, while it was still dark, and threatened to kill him unless he opened the library for him. The vampire was with him when I called him this morning, but he dared not tell me about his presence. When the strange man heard who had called, he said they must go at once to the archive. Mr. Erozan was afraid to disobey, and when they arrived here the man made him open the box. As soon as it sprang open, the devil leaped on him, held him on the ground - my friend says he was incredibly strong - and put his teeth in Mr. Erozan's neck. That is all he remembers.' Turgut shook his head sadly. Mr. Erozan suddenly grasped Turgut's arm and seemed to be imploring something of him in a flood of Turkish.

"For a moment Turgut was silent, and then he took his friend's hands in his, pressed the prayer beads into them, and gave him a quiet answer. 'He told me that he understands he can be bitten only twice more by this devil before becoming one himself. He asks me if this thing should come to pass to kill him with my own hands.' Turgut turned away, and I thought I saw a glistening of tears in his eyes.

"'It will not come to that.' Helen's face was hard. 'We are going to find the source of this plague.' I didn't know whether she meant the evil librarian or Dracula himself, but when I saw the set of her jaw I could almost believe in our eventual success in vanquishing both. I had noted that look on her face once before, and the sight of it took me back to the table of the diner at home, where we'd first talked about her parentage. Then she had been vowing to find her disloyal father and unmask him to the academic world. Was I imagining it, I wondered, or had her mission shifted at some moment that she herself hadn't noticed?

"Selim Aksoy had been hovering behind us, and now he spoke to Turgut again. Turgut nodded. 'Mr. Aksoy has reminded me of the work we have come here to do, and he is right. Other researchers will begin to arrive soon, and we must either lock the archive or open it to the public. He offers to desert his shop today and serve as librarian here. But first we must clean up these documents and see what damage has been done to them, and above all we must find a safe place for my friend to rest. Also, Mr. Aksoy would like to show us something in the archives before other people are present.'

"I began at once to gather up the scattered documents, and my worst fears were immediately confirmed. 'The original maps are gone,' I reported gloomily. We searched the stacks, but the maps of that strange region that looked like a long-tailed dragon had vanished. We could only conclude that the vampire had hidden them on his person even before we'd arrived. It was a dreary thought. We had copies, of course, in both Rossi's hand and Turgut's, but the originals represented to me a key to Rossi's whereabouts, a closer link than any other I'd handled so far.

"In addition to the discouragement of losing this treasure, there came to me the thought that the evil librarian might unlock its secrets before we did. If Rossi was at Dracula's tomb, wherever it lay, the evil librarian now had a fair chance of beating us there. I felt more than ever the twin urgency and impossibility of finding my beloved adviser. At least - it came to me again, strangely - Helen was now solidly on my side.

"Turgut and Selim had been conferring beside the sick man, and now they turned to ask him a question, it seemed, for he tried to raise himself and pointed feebly to the back of the stacks. Selim vanished, returning after a few minutes with a small book. It was bound in red leather, rather worn, with a gold inscription in Arabic on the front. He set it on a nearby table and searched through it for some time before beckoning to Turgut, who was folding his jacket to make a pillow for his friend's head. The man seemed a little more comfortable now. It was on the tip of my tongue to suggest we call an ambulance, but I felt Turgut must know what he was doing. He had risen to join Selim, and they conferred earnestly for a few minutes while Helen and I avoided each other's eyes, both of us hoping for some discovery, and both fearing further disappointment. Finally, Turgut called us over.

"'This is what Selim Aksoy wished to show us here this morning,' he said gravely. 'I do not know, in truth, whether it has any bearing on our search. However, I will read it to you. This is a volume compiled in the early nineteenth century by some editors whose names I have not seen before, historians of Istanbul. They collected here all the accounts they could find of life in Istanbul in the first years of our city - that is, beginning in 1453, when Sultan Mehmed took the city for his own and proclaimed it the capital of his empire.'

"He pointed to a page of beautiful Arabic, and I thought for the hundredth time how terrible it was that human languages and even alphabets were separated from one another by this frustrating Babel of differences, so that when I glanced at a page of Ottoman printing, my comprehension was immediately caught in a bramble of symbols as impenetrable to me as a hedge of magic briars. 'This is a passage that Mr. Aksoy remembered from one of his researches here. The author is unknown, and it is an account of some events in the year 1477 - yes, my friends, the year after Vlad Dracula was killed in battle in Wallachia. Here it tells how in that year there were cases of the plague in Istanbul, a plague that caused the imams to bury some of the corpses with stakes through their hearts. Then it tells about the entrance into the city of a party of monks from the Carpathians - this is what made Mr. Aksoy remember the volume - in a wagon pulled by mules. The monks begged for asylum in a monastery in Istanbul and resided there for nine days and nine nights. That is the whole account, and the connections within it are very unclear - it says nothing more about the monks or what became of them. It was this word Carpathian that my friend Selim wished us to know about here.'

"Selim Aksoy nodded emphatically, but I could not help sighing. The passage had a weird resonance; it gave me a feeling of unquiet without shedding any light on our problems. The year 1477 - that was indeed strange, but it could have been a coincidence. Curiosity prompted me to ask Turgut a question, however. 'If the city was already under the rule of the Ottomans, why was there a monastery for the monks to be lodged in?'

"'A good question, my friend,' Turgut observed soberly. 'But I must tell you there were a number of churches and monasteries in Istanbul from the very beginning of the Ottoman rule. The sultan was most gracious in his permissions to them.'

"Helen shook her head. 'After he had allowed his army to destroy most of the churches in the city, or had taken them for mosques.' "'It is true that when Sultan Mehmed conquered the city, he allowed his troops to pillage it for three days,' Turgut admitted. 'But he would not have done this if the city had surrendered to him instead of resisting - in fact, he offered them a completely peaceful settlement. It is also written that when he entered Constantinople and saw the damage his soldiers had done - the buildings they had defaced, the churches they had defiled, and the citizens they had slain - he wept for the beautiful city. From this time he allowed a number of churches to function and gave many advantages to the Byzantine inhabitants.'

"'He also enslaved more than fifty thousand of them,' Helen put in dryly.

'Don't forget about that.'

"Turgut gave her an admiring smile. 'Madam, you are too much for me. But I meant only to demonstrate that our sultans were not monsters. Once they had conquered an area, they were often rather lenient, for those times. It was just the conquering that was not so delightfully done.' He pointed to the far wall of the archive. 'There is His Gloriousness Mehmed himself, if you would like to greet him.' I went to look, although Helen stood stubbornly where she was. The framed reproduction - apparently a cheap copy of a watercolor - showed a solid, seated man in a white-and-red turban. He was fair skinned and delicately bearded, with calligraphic eyebrows and hazel eyes. He held a single rose up to his great hooked nose, sniffing it and gazing off into the distance. He looked to me more like a Sufi mystic than a ruthless conqueror.

"'It's a rather surprising image,' I said.

"'Yes. He was a devoted patron of the arts and architecture, and he built many lovely buildings here.' Turgut tapped his chin with a large finger. 'Well, my friends, what do you think of this account Selim Aksoy has discovered?'

"'It's interesting,' I said politely, 'but I can't see how it helps us find the tomb.'

"'I can't see that either,' Turgut admitted. 'However, I note a certain similarity here between this passage and the fragment of a letter I read to you this morning. The disturbances in the tomb at Snagov, whatever they were, occurred in the same year - 1477. We know already that that is the year after Vlad Dracula died, and that it was a group of monks who were so concerned about something at Snagov. Couldn't these have been the same monks, or some group connected with Snagov?'

"'Possibly,' I admitted, 'but that is conjecture. This account says only that the monks were from the Carpathians. The Carpathians must have been full of monasteries in that era. How could we be sure they were from the monastery at Snagov? Helen, what do you think?'

"I must have caught her by surprise, because I found she was looking directly at me with a kind of wistfulness I had never seen in her face before. The impression vanished immediately, however, and I thought I might have imagined it, or that perhaps she was remembering her mother and our imminent trip to Hungary. Wherever her thoughts had been, she rallied at once. 'Yes, there were many monasteries in the Carpathians. Paul is right - we cannot connect the two groups without more information.'

"I thought Turgut looked disappointed, and he began to say something, but just then we were interrupted by a wheezing gasp. It was Mr. Erozan, still resting on Turgut's jacket on the floor. 'He's fainted!' Turgut cried. 'Here we are chatting like magpies - ' He held the garlic to his friend's nose again, and the man spluttered and revived a little. 'Quick, we must take him home. Professor, madam, help me. We will call a taxicab and carry him to my apartment. My wife and I can care for him there. Selim will stay here with the archive - it must open very soon.' He gave Aksoy a few rapid orders in Turkish.

"Then Turgut and I lifted the pale, weak man from the floor, propped him between us, and carried him carefully through the back door. Helen followed with Turgut's jacket, we passed through the alley, and a moment later we were out in the morning sunlight. When it struck Mr. Erozan's face, he cringed, shrank against my shoulder, and held one hand up to his eyes as if warding off a blow."