"What the hell are you trying to tell me, Mike?"

  "Why shouldn't she have been Joan of Arc?" I asked. "Listen, Joe. This is making me just as nutty as you are. You know what I've just been doing? I've been talking to Genghis Khan on this fucking telephone of yours."

  * * * *

  I managed to get a few hours of sleep by simply refusing to tell Hedley anything else until I'd had a chance to rest. The way I said it, I left him no options, and he seemed to grasp that right away. At the hotel, I sank from consciousness like a leaden whale, hoping I wouldn't surface again before noon, but old habit seized me and pushed me up out of the tepid depths at seven, irreversibly awake and not a bit less depleted. I put in a quick call to Seattle to tell Elaine that I was going to stay down in La Jolla a little longer than expected. She seemed worried -- not that I might be up to any funny business, not me, but only that I sounded so groggy. "You know Joe," I said. "For him it's a twenty-four hour information world." I told her nothing else. When I stepped out on the breakfast patio half an hour later, I could see the lab's blue van already waiting in the hotel lot to pick me up.

  Hedley seemed to have slept at the lab. He was rumpled and red-eyed but somehow he was at normal functioning level, scurrying around the place like a yappy little dog. "Here's a printout of last night's contact," he said, the moment I came in. "I'm sorry if the transcript looks cockeyed. The computer doesn't know how to spell in Mongolian." He shoved it into my hands. "Take a squint at it and see if you really heard all the things you thought you heard."

  I peered at the single long sheet. It seemed to be full of jabberwocky, but once I figured out the computer's system of phonetic equivalents I could read it readily enough. I looked up after a moment, feeling very badly shaken.

  "I was hoping I dreamed all this. I didn't."

  "You want to explain it to me?"

  "I can't."

  Joe scowled. "I'm not asking for fundamental existential analysis. Just give me a goddamned translation, all right?"

  "Sure," I said.

  He listened with a kind of taut, explosive attention that seemed to me to be masking a mixture of uneasiness and bubbling excitement. When I was done he said, "Okay. What's this Genghis Khan stuff?"

  "Temujin was Genghis Khan's real name. He was born around ll67 and his father Yesugei was a minor chief somewhere in north-eastern Mongolia. When Temujin was still a boy, his father was poisoned by enemies, and he became a fugitive, but by the time he was fifteen he started putting together a confederacy of Mongol tribes, hundreds of them, and eventually he conquered everything in sight. Genghis Khan means 'Ruler of the Universe.'"

  "So? Our Mongol lives in Constantinople, you say. He's a Christian and he uses a Greek name."

  "He's Temujin, son of Yesugei. He's twenty years old in the year when Genghis Khan was twenty years old."

  Hedley looked belligerent. "Some other Temujin. Some other Yesugei."

  "Listen to the way he speaks. He's scary. Even if you can't understand a word of what he's saying, can't you feel the power in him? The coiled-up anger? That's the voice of somebody capable of conquering whole continents."

  "Genghis Khan wasn't a Christian. Genghis Khan wasn't kidnapped by strangers and taken to live in Constantinople."

  "I know," I said. To my own amazement I added, "But maybe this one was."

  "Jesus God Almighty. What's that supposed to mean?"

  "I'm not certain."

  Hedley's eyes took on a glaze. "I hoped you were going to be part of the solution, Mike. Not part of the problem."

  "Just let me think this through," I said, waving my hands above his face as if trying to conjure some patience into him. Joe was peering at me in a stunned, astounded way. My eyeballs throbbed. Things were jangling up and down along my spinal column. Lack of sleep had coated my brain with a hard crust of adrenaline. Bewilderingly strange ideas were rising like sewer gases in my mind and making weird bubbles. "All right, try this," I said at last. "Say that there are all sorts of possible worlds. A world in which you're King of England, a world in which I played third base for the Yankees, a world in which the dinosaurs never died out and Los Angeles gets invaded every summer by hungry tyrannosaurs. And one world where Yesugei's son Temujin wound up in twelfth-century Byzantium as a Christian instead of founding the Mongol Empire. And that's the Temujin I've been talking to. This cockeyed beam of yours not only crosses time-lines, somehow it crosses probability-lines too, and we've fished up some alternate reality that -- "

  "I don't believe this," Hedley said.

  "Neither do I, really. Not seriously. I'm just putting forth one possible hypothesis that might explain -- "

  "I don't mean your fucking hypothesis. I mean I find it hard to believe that you of all people, my old pal Mike Michaelson, can be standing here running off at the mouth this way, working hard at turning a mystifying event into a goddamned nonsensical one -- you, good old sensible steady Mike, telling me some shit about tyrannosaurs amok in Los Angeles -- "

  "It was only an example of -- "

  "Oh, fuck your example," Hedley said. His face darkened with exasperation bordering on fury. He looked ready to cry. "Your example is absolute crap. Your example is garbage. You know, man, if I wanted someone to feed me a lot of New Age crap I didn't have to go all the way to Seattle to find one. Alternate realities! Third base for the Yankees!"

  A girl in a lab coat appeared out of nowhere and said, "We have signal acquisition, Dr. Hedley."

  I said, "I'll catch the next plane north, okay?"

  Joe's face was red and starting to do its puff-adder trick and his adam's-apple bobbed as if trying to find the way out.

  "I wasn't trying to mess up your head," I said. "I'm sorry if I did. Forget everything I was just saying. I hope I was at least of some help, anyway."

  Something softened in Joe's eyes.

  "I'm so goddamned tired, Mike."

  "I know."

  "I didn't mean to yell at you like that."

  "No offense taken, Joe."

  "But I have trouble with this alternate-reality thing of yours. You think it was easy for me to believe that what we were doing here was talking to people in the past? But I brought myself around to it, weird though it was. Now you give it an even weirder twist, and it's too much. It's too fucking much. It violates my sense of what's right and proper and fitting. You know what Occam's Razor is, Mike? The old medieval axiom, Never multiply hypotheses needlessly? Take the simplest one. Here even the simplest one is crazy. You push it too far."

  "Listen," I said, "if you'll just have someone drive me over to the hotel -- "

  "No."

  "No?"

  "Let me think a minute," he said. "Just because it doesn't make sense doesn't mean that it's impossible, right? And if we get one impossible thing, we can have two, or six, or sixteen. Right? Right?" His eyes were like two black holes with cold stars blazing at their bottoms. "Hell, we aren't at the point where we need to worry about explanations. We have to find out the basic stuff first. Mike, I don't want you to leave. I want you to stay here."

  "What?"

  "Don't go. Please. I still need somebody to talk to the Mongol for me. Don't go. Please, Mike? Please?"

  * * * *

  The times, Temujin said, were very bad. The infidels under Saladin had smashed the Crusader forces in the Holy Land and Jerusalem itself had fallen to the Moslems. Christians everywhere mourn the loss, said Temujin. In Byzantium -- where Temujin was captain of the guards in the private army of a prince named Theodore Lascaris -- God's grace seemed also to have been withdrawn. The great empire was in heavy weather. Insurrections had brought down two emperors in the past four years and the current man was weak and timid. The provinces of Hungary, Cyprus, Serbia, and Bulgaria were all in revolt. The Normans of Sicily were chopping up Byzantine Greece and on the other side of the empire the Seljuk Turks were chewing their way through Asia Minor. "It is the time of the wolf," said Temujin. "But the sword of the Lord will prevail."

  The sheer force of him was astounding. It lay not so much in what he said, although that was sharp and fierce, as in the way he said it. I could feel the strength of the man in the velocity and impact of each syllable. Temujin hurled his words as if from a catapult. They arrived carrying a crackling electrical charge. Talking with him was like holding live cables in my hands.

  Hedley, jigging and fidgeting around the lab, paused now and then to stare at me with what looked like awe and wonder in his eyes, as if to say, _You really can make sense of this stuff_? I smiled at him. I felt bizarrely cool and unflustered. Sitting there with some electronic thing on my head, letting that terrific force go hurtling through my brain. Discussing twelfth-century politics with an invisible Byzantine Mongol. Making small talk with Genghis Khan. All right. I could handle it.

  I beckoned for notepaper. _Need printout of world historical background late twelfth century_, I scrawled, without interrupting my conversation with Temujin. _Esp. Byzantine history, Crusades, etc._

  The kings of England and France, said Temujin, were talking about launching a new Crusade. But at the moment they happened to be at war with each other, which made cooperation difficult. The powerful Emperor Frederick Barbarossa of Germany was also supposed to be getting up a Crusade, but that, he said, might mean more trouble for Byzantium than for the Saracens, because Frederick was the friend of Byzantium's enemies in the rebellious provinces, and he'd have to march through those provinces on the way to the Holy Land.

  "It is a perilous time," I agreed.

  Then suddenly I was feeling the strain. Temujin's rapid-fire delivery was exhausting to follow, he spoke Mongolian with what I took to be a Byzantine accent, and he sprinkled his statements with the names of emperors, princes, and even nations that meant nothing to me. Also there was that powerful force of him to contend with -- it hit you like an avalanche -- and beyond that his anger: the whipcrack inflection that seemed the thinnest of bulwarks against some unstated inner rage, fury, frustration. It's hard to feel at ease with anyone who seethes that way. Suddenly I just wanted to go somewhere and lie down.

  But someone put printout sheets in front of me, closely packed columns of stuff from the _Britannica_. Names swam before my eyes: Henry II, Barbarossa, Stephan Nemanya, Isaac II Angelos, Guy of Jerusalem, Richard the Lion-Hearted. Antioch, Tripoli, Thessalonica, Venice. I nodded my thanks and pushed the sheets aside.

  Cautiously I asked Temujin about Mongolia. It turned out that he knew almost nothing about Mongolia. He'd had no contact at all with his native land since his abduction at the age of eleven by Byzantine traders who carried him off to Constantinople. His country, his father, his brothers, the girl to whom he had been betrothed when he was still a child -- they were all just phantoms to him now, far away, forgotten. But in the privacy of his own soul he still spoke Khalkha. That was all that was left.

  By 1187, I knew, the Temujin who would become Genghis Khan had already made himself the ruler of half of Mongolia. His fame would surely have spread to cosmopolitan Byzantium. How could this Temujin be unaware of him? Well, I saw one way. But Joe had already shot it down. And it sounded pretty nutty even to me.

  "Do you want a drink?" Hedley asked. "Tranks? Aspirin?"

  I shook my head. "I'm okay," I murmured.

  To Temujin I said, "Do you have a wife? Children?"

  "I have vowed not to marry until Jesus rules again in His own land."

  "So you're going to go on the next Crusade?" I asked.

  Whatever answer Temujin made was smothered by static.

  Awkkk. Skrrkkk. Tsssshhhhhhh.

  Then silence, lengthening into endlessness.

  "Signal's gone," someone said.

  "I could use that drink now," I said. "Scotch."

  The lab clock said it was ten in the morning. To me it felt like the middle of the night.

  * * * *

  An hour had passed. The signal hadn't returned.

  Hedley said, "You really think he's Genghis Khan?"

  "I really think he _could_ have been."

  "In some other probability world."

  Carefully I said, "I don't want to get you all upset again, Joe."

  "You won't. Why the hell _not_ believe we're tuned into an alternate reality? It's no more goofy than any of the rest of this. But tell me this: is what he says consistent with being Genghis Khan?"

  "His name's the same. His age. His childhood, up to the point when he wandered into some Byzantine trading caravan and they took him away to Constantinople with them. I can imagine the sort of fight he put up, too. But his life-line must have diverged completely from that point on. A whole new world-line split off from ours. And in that world, instead of turning into Genghis Khan, ruler of all Mongolia, he grew up to be Petros Alexios of Prince Theodore Lascaris' private guards."

  "And he has no idea of who he could have been?" Joe asked.

  "How could he? It isn't even a dream to him. He was born into another world that wasn't ever destined to have a Genghis Khan. You know the poem: _

  'Our birth is but a sleep and a forgetting.

  The soul that rises with us, our life's star,

  Hath had elsewhere its setting,

  And cometh from afar.'" _

  "Very pretty. Is that Yeats?" Hedley said.

  "Wordsworth," I said. "When's the signal coming back?"

  "An hour, two, three. It's hard to say. You want to take a nap, and we'll wake you when we have acquisition?"

  "I'm not sleepy."

  "You look pretty ragged," Joe said.

  I wouldn't give him the satisfaction.

  "I'm okay. I'll sleep for a week, later on. What if you can't raise him again?"

  "There's always that chance, I suppose. We've already had him on the line five times as long as all the rest put together."

  "He's a very determined man," I said.

  "He ought to be. He's Genghis fucking Khan."

  "Get him back," I said. "I don't want you to lose him. I want to talk to him some more."

  * * * *

  Morning ticked on into afternoon. I phoned Elaine twice while we waited, and I stood for a long time at the window watching the shadows of the oncoming winter evening fall across the hibiscus and the bougainvillea, and I hunched my shoulders up and tried to pull in the signal by sheer body english. Contemplating the possibility that they might never pick up Temujin again left me feeling weirdly forlorn. I was beginning to feel that I had a real relationship with that eerie disembodied angry voice coming out of the crackling night. Toward mid-afternoon I thought I was starting to understand what was making Temujin so angry, and I had some things I wanted to say to him about that.

  Maybe you ought to get some sleep, I told myself.

  At half past four someone came to me and said the Mongol was on the line again.

  The static was very bad. But then came the full force of Temujin soaring over it. I heard him saying, "The Holy Land must be redeemed. I cannot sleep so long as the infidels possess it."

  I took a deep breath.

  In wonder I watched myself set out to do something unlike anything I had ever done before.

  "Then you must redeem it yourself," I said firmly.

  "I?"

  "Listen to me, Temujin. Think of another world far from yours. There is a Temujin in that world too, son of Yesugei, husband to Bortei who is daughter of Dai the Wise."

  "Another world? What are you saying?"

  "Listen. Listen. He is a great warrior, that other Temujin. No one can withstand him. His own brothers bow before him. All Mongols everywhere bow before him. His sons are like wolves, and they ride into every land and no one can withstand them. This Temujin is master of all Mongolia. He is the Great Khan, the Genghis Khan, the ruler of the universe."

  There was silence. Then Temujin said, "What is this to me?"

  "He is you, Temujin. You are the Genghis Khan."

  Silence again, longer, broken by hideous shrieks of interplanetary noise.

  "I have no sons and I have not seen Mongolia in years, or even thought of it. What are you saying?"

  "That you can be as great in your world as this other Temujin is in his."

  "I am Byzantine. I am Christian. Mongolia is nothing to me. Why would I want to be master in that savage place?"

  "I'm not talking about Mongolia. You are Byzantine, yes. You are Christian. But you were born to lead and fight and conquer," I said. "What are you doing as a captain of another man's palace guards? You waste your life that way, and you know it, and it maddens you. You should have armies of your own. You should carry the Cross into Jerusalem."

  "The leaders of the new Crusade are quarrelsome fools. It will end in disaster."

  "Perhaps not. Frederick Barbarossa's Crusade will be unstoppable."

  "Barbarossa will attack Byzantium instead of the Moslems. Everyone knows that."

  "No," I said. That inner force of Temujin was rising and rising in intensity, like a gale climbing toward being a hurricane. I was awash in sweat, now, and I was dimly aware of the others staring at me as though I had lost my senses. A strange exhilaration gripped me. I went plunging joyously ahead. "Emperor Isaac Angelos will come to terms with Barbarossa. The Germans will march through Byzantium and go on toward the Holy Land. But there Barbarossa will die and his army will scatter -- unless you are there, at his right hand, taking command in his place when he falls, leading them onward to Jerusalem. You, the invincible, the Genghis Khan."

  There was silence once more, this time so prolonged that I was afraid the contact had been broken for good.

  Then Temujin returned. "Will you send soldiers to fight by my side?" he asked.

  "That I cannot do."

  "You have the power to send them, I know," said Temujin. "You speak to me out of the air. I know you are an angel, or else you are a demon. If you are a demon, I invoke the name of Christos Pantokrator upon you, and begone. But if you are an angel, you can send me help. Send it, then, and I will lead your troops to victory. I will take the Holy Land from the infidel. I will create the Empire of Jesus in the world and bring all things to fulfillment. Help me. Help me."

  "I've done all I can," I said. "The rest is for you to achieve."