Vasiliy remembered that apocalyptic September of 2001. A few days after the Twin Towers’ collapse, he had gone in with the health department, starting with the shuttered restaurants around the perimeter of the site, clearing away abandoned food. Then down into the basements and underground rooms, never once seeing a live rat, but plenty of evidence of their presence, including miles of rat tracks enshrined in the settled dust. He remembered most vividly a Mrs. Fields cookie shop, almost entirely eaten through. The rat population was exploding at the site, the concern being that the rats would spill out of the ruins in search of new food sources, swarming into the surrounding streets and neighborhoods. So a massive, federally funded containment program was undertaken. Thousands of bait stations and steel-wire traps were set down in and around Ground Zero, and, thanks to Vasiliy’s vigilance and that of others like him, the feared invasion never did materialize.

Vasiliy remained on a government contract to this day, his department overseeing a rat-control study in and around Battery Park. So he was pretty well caught up on local infestations, and had been throughout the beginnings of the construction project. And until now everything had been business as usual.

He looked down at the trucks pouring cement and the cranes moving rubble. He waited three minutes for a young boy to finish with one of the mounted viewfinders—the same kind they have on the top of the Empire State Building—then dropped in his two quarters and scanned the work site.

In a moment, he saw them, their little brown bodies scuttling out from corners, racing around stone piles, a few scampering hell bent for leather up the access road toward Liberty Street. Racing around rebar spikes marking the foundation of the Freedom Tower as though running a goddamned obstacle course. He looked for the breaks where the new construction would connect underground with the PATH subway. Then he turned the viewfinder higher and followed a line of them scrambling up the underpinnings of a steel platform along the east corner, clambering out onto strung wires. They were racing out of the basin, a mass exodus, following any escape route they could find.

Isolation Ward, Jamaica Hospital Medical Center

BEHIND THE SECOND DOOR of the isolation ward, Eph pulled on latex gloves. He would have insisted that Setrakian do the same, but another look at his crooked fingers made Eph wonder if it would even be possible.

They walked inside Jim Kent’s bay, the only occupied station in the otherwise empty ward. Jim lay sleeping now, still in his street clothes, wires from his chest and hand leading to machines whose readings were quiet. The attending nurse had said his levels were dipping so low that all the automatic alarms—low heart rate, blood pressure, respiration, oxygen levels—had to be muted, because they kept going off.