The dead were often surprised by such memories. They might go weeks and months without thinking of the houses and neighborhoods they had grown up in, their triumphs of shame and glory, the jobs, routines, and hobbies that had slowly eaten away their lives, yet the smallest, most inconsequential episode would leap into their thoughts a hundred times a day, like a fish smacking its tail on the surface of a lake. The old woman who begged for quarters in the subway remembered eating a meal of crab cakes and horseradish on a dock by Chesapeake Bay. The man who lit the gas lamps in the theater district remembered taking a can of beans from the middle of a supermarket display pyramid and feeling a flicker of pride and then a flicker of amusement at his pride when the other cans did not fall. Andreas Andreopoulos, who had written code for computer games the whole forty years of his adult life, remembered leaping to pluck a leaf from a tree, and opening a fashion magazine to smell the perfume inserts, and writing his name in the condensation on a glass of beer. They preoccupied him – these formless, almost clandestine memories. They seemed so much heavier than they should have been, as if they were where the true burden of his life's meaning lay. He sometimes thought of piecing them together into an autobiography, all the toy-sized memories that had replaced the details of his work and family, and leaving everything else out. He would write it by hand on sheets of unlined notebook paper. He would never touch a computer again.

There were places in the city where the crowds were so swollen you could not move without pressing into some arm or hip or gut. As the numbers of the dead increased, these areas became more and more common. It was not that the city had no room for its inhabitants but that when they chose to herd together, they did so in certain places, and the larger the population grew the more congested these places became. The people who were comfortable in their privacy learned to avoid them. If they wanted to visit the open square in the monument district, or the fountains in the neon district, they would have to wait until the population diminished, which always seemed to happen in times of war or plague or famine.

The park beside the river was the busiest of the city's busy places, with its row of white pavilions and its long strip of living grass. Kite vendors and soft drink stands filled the sidewalks, and saddles of rock carved the water into dozens of smoothly rounded coves. There came a day when a man with a thick gray beard and a tent of bushy hair stumbled out of one of the pavilions and began to bump into the shoulders of the people around him. He was plainly disoriented, and it was obvious to everyone who saw him that he had just passed through the crossing. He said that he was a virologist by profession. He had spent the last five days climbing the branches of an enormous maple tree, and his clothing was tacked to his skin with sap. He seemed to think that everybody who was in the park had also been in the tree with him. When someone asked him how he had died, he drew in his breath and paused for a moment before he answered. "That's right, I died. I have to keep reminding myself. They finally did it, the sons of bitches. They found a way to pull the whole thing down." He twisted a plug of sap from his beard.

"Hey, did any of you notice some sort of thumping noise inside the tree?"

It was not long after this that the city began to empty out.

The single-room office of the L. Sims News & Speculation Sheet was in one of the city's oldest buildings, constructed of chocolate-colored brick and masses of silver granite. Streamers of pale yellow moss trailed from the upper floors, hanging as low as the ledge above the front door. Each morning as Luka Sims stood cranking away at his mimeograph machine, sunlight filtered through the moss outside his window and the room was saturated with a warm, buttery light. Sometimes he could hardly look out at the city without imagining that he was gazing through a dying forest.

By seven o'clock, he would have printed a few thousand copies of his circular and taken them to the River Road Coffee Shop, where he would hand them out to the pedestrians. He liked to believe that each person who took one read it and passed it on to someone else, who read it and passed it on to someone else, who read it and passed it on to someone else, but he knew that this was not the case, since he always saw at least a few copies in the trash on his way home, the paper gradually uncrinkling in the sun. Still, it was not unusual for him to look inside the coffee shop and see twenty or thirty heads bent over copies of the latest Sims Sheet. He had been writing fewer stories about the city recently and more about the world of the living, stories he assembled from interviews with the recent dead, most of whom were victims of what they called "the epidemic." These people tended to blink a lot – he noticed that. They squinted and rubbed at their eyes. He wondered if it had anything to do with the virus that had killed them.

Luka saw the same faces behind the coffee shop window every day. HUNDREDS EXPOSED TO VIRUS IN TOKYO. NEW EPICENTERS DISCOVERED IN JOHANNESBURG, COPENHAGEN, PERTH. Ellison Brown, who prepared the baked desserts in the kitchen, always waited for Luka to leave before he glanced at the headlines. His wife had been a poet of the type who liked to loom nearby with a fretful look on her face while he read whatever she had written that day, and there was nothing that bothered him more than the feeling that he was being watched, INCUBATION PERIOD LESS THAN FIVE HOURS. EXPOSURE AT NOON, MORTALITY AT MIDNIGHT. Charlotte Sylvain would sip at her coffee as she scanned the paper for any mention of Paris. She still considered the city her hometown, though she had not been there in fifty years. Once, she saw the word "Seine" printed in the first paragraph of an article and her fingers tightened involuntarily around the page, but it was only a misprint of the word "sienna," and she would never see her home again, VIRUS BECOMES AIRBORNE, WATERBORNE. TWO BILLION DEAD IN ASIA AND EASTERN EUROPE. Mie Matsuda Ryu was an enthusiast of word games. She liked to read the Sims Sheet twice every morning, once for content and once for any hidden patterns she could find – palindromes, anagrams, the letters of her own name scrambled inside other words. She never failed to spot them. "TWENTY-FOUR-HOUR BUG" CROSSES ATLANTIC. FATALITY RATE NEARING ONE HUNDRED PERCENT.

The people who went knocking on the doors of the city began to notice something unusual. The evangelists and traveling salesmen, the petitioners and census takers, they all said the same thing: the numbers of the dead were shrinking. There were empty rooms in empty buildings that had been churning with bodies just a few weeks before. The streets were not so crowded anymore. It was not that people were no longer dying. In fact, there were more people dying than ever. They arrived by the thousands and the hundreds of thousands, every minute of every hour, whole houses and schools and neighborhoods of them. But for every person who made it through the crossing, two or three seemed to disappear. Russell Henley, who sold brooms that he lashed together from cedar branches and hanks of plastic fiber, said that the city was like a pan with a hole in it: "No matter how much water you let in, it keeps pouring right through." He ran a stall in the monument district, where he assembled his brooms, marketing them to the passing crowds, which barely numbered in the low hundreds these days. If the only life they had was bestowed upon them by the memories of the living, as Russell was inclined to believe, what would happen when the rest of the living were gathered into the city? What would happen, he wondered, when that other room, the larger world, had been emptied out?