"Watch the picture," said Nefastis, "and concentrate on a cylinder. Don't worry. If you're a sensitive you'll know which one. Leave your mind open, receptive to the Demon's message. I'll be back." He returned to his TV set, which was now showing cartoons. Oedipa sat through two Yogi Bears, one Magilla Gorilla and a Peter Potamus, staring at Clerk Maxwell's enigmatic profile, waiting for the Demon to communicate.

Are you there, little fellow, Oedipa asked the Demon, or is Nefastis putting me on. Unless a piston moved, she'd never know. Clerk Maxwell's hands were cropped out of the photograph. He might have been holding a book. He gazed away, into some vista of Victorian England whose light had been lost forever. Oedipa's anxiety grew. It seemed, behind the beard, he'd begun, ever so faintly, to smile. Something in his eyes, certainly, had changed…

And there. At the top edge of what she could see: hadn't the right-hand piston moved, a fraction? She couldn't look directly, the instructions were to keep her eyes on Clerk Maxwell. Minutes passed, pistons remained frozen in place. High-pitched, comic voices issued from the TV set. She had seen only a retinal twitch, a misfired nerve cell. Did the true sensitive see more? In her colon now she was afraid, growing more so, that nothing would happen. Why worry, she worried; Nefastis is a nut, forget it, a sincere nut. The true sensitive is the one that can share in the man's hallucinations, that's all.

How wonderful they might be to share. For fifteen minutes more she tried; repeating, if you are there, whatever you are, show yourself to me, I need you, show yourself. But nothing happened.

"I'm sorry," she called in, surprisingly about to cry with frustration, her voice breaking, "It's no use." Nefastis came to her and put an arm around her shoulders.

"It's OK," he said. "Please don't cry. Come on in on the couch. The news will be on any minute. We can do it there."

"It?" said Oedipa. "Do it? What?"

"Have sexual intercourse," replied Nefastis. "Maybe there'll be something about China tonight. I like to do it while they talk about Viet Nam, but China is best of all. You think about all those Chinese. Teeming. That profusion of life. It makes it sexier, right?"

"Gah," Oedipa screamed, and fled, Nefastis snapping his fingers through the dark rooms behind her in a hippy-dippy, oh-go-ahead-then-chick fashion he had doubtless learned from watching the TV also.

"Say hello to old Stanley," he called as she pattered down the steps into the street, flung a babushka over her license plate and screeched away down Telegraph. She drove more or less automatically until a swift boy in a Mustang, perhaps unable to contain the new sense of virility his auto gave him, nearly killed her and she realized that she was on the freeway, heading irreversibly for the Bay Bridge. It was the middle of rush hour. Oedipa was appalled at the spectacle, having thought such traffic only possible in Los Angeles, places like that. Looking down at San Francisco a few minutes later from the high point of the bridge's arc, she saw smog. Haze, she corrected herself, is what it is, haze. How can they have smog in San Francisco? Smog, according to the folklore, did not begin till farther south. It had to be the angle of the sun.

Amid the exhaust, sweat, glare and ill-humor of a summer evening on an American freeway, Oedipa Maas pondered her Trystero problem. All the silence of San Narciso-the calm surface of the motel pool, the contemplative contours of residential streets like rakings in the sand of a Japanese garden-had not allowed her to think as leisurely as this freeway madness.

For John Nefastis (to take a recent example) two kinds of entropy, thermodynamic and informational, happened, say by coincidence, to look alike, when you wrote them down as equations. Yet he had made his mere coincidence respectable, with the help of Maxwell's Demon.

Now here was Oedipa, faced with a metaphor of God knew how many parts; more than two, anyway. With coincidences blossoming these days wherever she looked, she had nothing but a sound, a word, Trystero, ato hold them together.

She knew a few things about it: it had opposed the Thurn and Taxis postal system in Europe; its symbol was a muted post horn; sometime before 1853 it had appeared in America and fought the Pony Express and Wells, Fargo, either as outlaws in black, or disguised as Indians; and it survived today, in California, serving as a channel of communication for those of unorthodox sexual persuasion, inventors who believed in the reality of Maxwell's Demon, possibly her own husband, Mucho Maas (but she'd thrown Mucho's letter long away, there was no way for Genghis Cohen to check the stamp, so if she wanted to find out for sure she'd have to ask Mucho himself).

Either Trystero did exist, in its own right, or it was being presumed, perhaps fantasied by Oedipa, so hung up on and interpenetrated with the dead man's estate. Here in San Francisco, away from all tangible assets of that estate, there might still be a chance of getting the whole thing to go away and disintegrate quietly. She had only to drift tonight, at random, and watch nothing happen, to be convinced it was purely nervous, a little something for her shrink to fix. She got off the freeway at North Beach, drove around, parked finally in a steep side-street among warehouses. Then walked along Broadway, into the first crowds of evening.

But it took her no more than an hour to catch sight of a muted post horn. She was moseying along a street full of aging boys in Roos Atkins suits when she collided with a gang of guided tourists come rowdy-dowing out of a Volkswagen bus, on route to take in a few San Francisco nite spots. "Let me lay this on you," a voice spoke into her ear, "because I just left," and she found being deftly pinned outboard of one breast this big cerise ID badge, reading Hi! my name Is Arnold Snarb! and i'm lookin' for A good time! Oedipa glanced around and saw a cherubic face vanishing with a wink in among natural shoulders and striped shirts, and away went Arnold Snarb, looking for a better time.

Somebody blew on an athletic whistle and Oedipa found herself being herded, along with other badged citizens, toward a bar called The Greek Way. Oh, no, Oedipa thought, not a fag joint, no; and for a minute tried to fight out of the human surge, before recalling how she had decided to drift tonight.

"Now in here," their guide, sweating dark tentacles into his tab collar, briefed them, "you are going to see the members of the third sex, the lavender crowd this city by the Bay is so justly famous for. To some of you the experience may seem a little queer, but remember, try not to act like a bunch of tourists. If you get propositioned it'll all be in fun, just part of the gay night life to be found here in famous North Beach. Two drinks and when you hear the whistle it means out, on the double, regroup right here. If you're well behaved we'll hit Finocchio's next." He blew the whistle twice and the tourists, breaking into a yell, swept Oedipa inside, in a frenzied assault on the bar. When things had calmed she was near the door with an unidentifiable drink in her fist, jammed against somebody tall in a suede sport coat. In the lapel of which she spied, wrought exquisitely in some pale, glimmering alloy, not another cerise badge, but a pin in the shape of the Trystero post horn. Mute and everything.

All right, she told herself. You lose. A game try, all one hour's worth. She should have left then and gone back to Berkeley, to the hotel. But couldn't.

"What if I told you," she addressed the owner of the pin, "that I was an agent of Thurn and Taxis?"