As Stillman reached the threshold of the station, he put his bag down once again and paused. At that moment Quinn allowed himself a glance to Stillman's right, surveying the rest of the crowd to be doubly sure he had made no mistakes. What happened then defied explanation. Directly behind Stillman, heaving into view just inches behind his right shoulder, another man stopped, took a lighter out of his pocket, and lit a cigarette. His face was the exact twin of Stillman's. For a second Quinn thought it was an illusion, a kind of aura thrown off by the electromagnetic currents in Stiliman's body. But no, this other Stillman moved, breathed, blinked his eyes; his actions were clearly independent of the first Stillman. The second Stillman had a prosperous air about him. He was dressed in an expensive blue suit; his shoes were shined; his white hair was combed; and in his eyes there was the shrewd look of a man of the world. He, too, was carrying a single bag: an elegant black suitcase, about the same size as the other Stillman's.

Quinn froze. There was nothing he could do now that would not be a mistake. Whatever choice he made-and he had to make a choice-would be arbitrary, a submission to chance. Uncertainty would haunt him to the end. At that moment, the two Stillmans started on their way again. The first turned right, the second turned left. Quinn craved an amoeba's body, wanting to cut himself in half and run off in two directions at once. "Do something," he said to himself, "do something now, you idiot." For no reason, he went to his left, in pursuit of the second Stillman. After nine or ten paces, he stopped. Something told him he would live to regret what he was doing. He was acting out of spite, spurred on to punish the second Stillman for confusing him. He turned around and saw the first Stillman shuffling off in the other direction. Surely this was his man. This shabby creature, so broken down. and disconnected from his surrounding-surely this was the mad Stillman. Quinn breathed deeply, exhaled with a trembling chest, and breathed in again. There was no way to know: not this, not anything. He went after the first Stillman, slowing his pace to match the old man's, and followed him to the subway.

It was nearly seven o'clock now, and the crowds had begun to thin out. Although Stillman seemed to be in a fog, he nevertherless knew where he was going. The professor went straight for the subway staircase, paid his money at the token booth below, and waited calmly on the platform for the Times Square Shuttle. Quinn began to lose his fear of being noticed. He had never seen anyone so lost in his own thoughts. Even if he stood directly in front of him, he doubted that Stillman would be able to see him.

They travelled to the West Side on the shuttle, walked through the dank corridors of the 42nd Street station, and went down another set of stairs to the IRT trains. Seven or eight minutes later they boarded the Broadway express, careened up town for two long stops, and got off at 96th Street. Slowly making their way up the final staircase, with several pauses as Stillman set down his bag and caught his breath, they surfaced on the corner and entered the indigo evening. Stillman did not hesitate. Without stopping to get his bearings, he began walking up Broadway along the east side of the street. For several minutes Quinn toyed with the irrational conviction that Stillman was walking toward his house on 107th Street. But before he could indulge himself in a full-blown panic, Stillman stopped at the comer of 99th Street, waited for the light to change from red to green, and crossed over to the other side of Broadway. Halfway up the block there was a small fleabag for down-and-outs, the Hotel Harmony. Quinn had passed it many times before, and he was familiar with the winos and vagabonds who hung around the place. It surprised him to see Stillman open the front door and enter the lobby. Somehow he had assumed the old man would have found more comfortable lodgings. But as Quinn stood outside the glass-paneled door and saw the professor walk up to the desk, write what was undoubtedly his name in the guest book, pick up his bag and disappear into the elevator, he realized that this was where Stillman meant to stay.

Quinn waited outside for the next two hours, pacing up and down the block, thinking that Stillman would perhaps emerge to look for dinner in one of the local coffee shops. But the old man did not appear, and at last Quinn decided he must have gone to sleep. He put in a call to Virginia Stillman from a pay booth on the comer, gave her a full report of what had happened, and then headed home to 107th Street.

8

THE next morning, and for many mornings to follow, Quinn posted himself on a bench in the middle of the traffic island at Broadway and 99th Street. He would arrive early, never later than seven o'clock, and sit there with a take-out coffee, a buttered roll, and an open newspaper on his lap, watching the glass door of the hotel. By eight o'clock Stillman would come out, always in his long brown overcoat, carrying a large, old-fashioned carpet bag. For two weeks this routine did not vary. The old man would wander through the streets of the neighborhood, advancing slowly, sometimes by the merest of increments, pausing, moving on again, pausing once more, as though each step had to, be weighed and measured before it could take its place among the sum total of steps. Moving in this manner was difficult for Quinn. He was used to walking briskly, and all this starting and stopping and shuffling began to be a strain, as though the rhythm of his body was being disrupted. He was the hare in pursuit of the tortoise, and again and again he had to remind himself to hold back.

What Stillman did on these walks remained something of a mystery to Quinn. He could, of course, see with his own eyes what happened, and all these things he dutifully recorded in his red notebook. But the meaning of these things continued to elude him. Stillman never seemed to be going anywhere in particular, nor did he seem to know where he was. And yet, as if by conscious design, he kept to a narrowly circumscribed area, bounded on the north by 110th Street, on the south by 72nd Street, on the west by Riverside Park, and on the east by Amsterdam Avenue. No matter how haphazard his journeys seemed to be-and each day his itinerary was different-Stillman never crossed these borders. Such precision baffled Quinn, for in all other respects Stillman seemed to be aimless.

As he walked, Stillman did not look up. His eyes were permanently fixed on the pavement, as though he were searching for something. Indeed, every now and then he would stoop down, pick some object off the ground, and examine it closely, turning it over and over in his hand. It made Quinn think of an archeologist inspecting a shard at some prehistoric ruin. Occasionally, after poring over an object in this way, Stillman would toss it back onto the sidewalk. But more often than not he would open his bag and lay the object gently inside it. Then, reaching into one of his coat pockets, he would remove a red notebook-similar to Quinn's but smaller-and write in it with great concentration for a minute or two. Having completed this operation, he would return the notebook to his pocket, pick up his bag, and continue on his way.

As far as Quinn could tell, the objects Stillman collected were valueless. They seemed to be no more than broken things, discarded things, stray bits of junk. Over the days that passed, Quinn noted a collapsible umbrella shom of its material, the severed head of a rubber doll, a black glove, the bottom of a shattered light bulb, several pieces of printed matter (soggy magazines, shredded newspapers), a tom photograph, anonymous machinery parts, and sundry other clumps of flotsam he could not identify. The fact that Stillman took this scavenging seriously intrigued Quinn, but he could do no more than observe, write down what he saw in the red notebook, hover stupidly on the surface of things. At the same time, it pleased him to know that Stillman also had a red notebook, as if this formed a secret link between them. Quinn suspected that Stillman's red notebook contained answers to the questions that had been accumulating in his mind, and he began to plot various stratagems for stealing it from the old man. But the time had not yet come for such a step.