She slammed the clutch of her Torino Cobra to the floor and downshifted hard, rev-matched and then sped up, leaving a twin-stripe signature in rubber on the concrete.

She wove through traffic until a jam loomed. “Come on, come on.” She detoured onto a crosstown street east, skidding into what would have been a U-turn, except to avoid a sudden jaywalker she had to make it a Q. She tried again and was soon bolting through side streets, making her way east and south, toward downtown.

“Hell,” Sachs muttered, faced with another jam, and decided to conscript the closest cross street, which was more or less clear, though it happened to be one-way, against her. The maneuver threw drivers into panic and raised a symphony of off-pitch horns. Some single fingers too. Then she zipped past a yellow cab just before the driver sought the sidewalk and she was on Broadway, heading south. She paused for most of the red lights.

There’s a lot of controversy about cell phone companies’ giving law officers details about phone use and location. Generally in an emergency, the providers will cooperate without a warrant. Otherwise, most will require a court order. Rodney Szarnek didn’t want to take any chances and so after learning the sniper’s number from Pulaski in the Bahamas he’d contacted a magistrate and gotten paper issued—both for a five-second listen-in, to snag the voiceprint, and to track the location.

Szarnek had learned that the phone was in use around the corner of Broadway and Warren Street, using basic triangulation for that information, which gave rough estimates. He was presently working on interpolating signal data from the nearby network antennas. Searching in urban areas was much easier because many more towers were erected there than in rural areas. The downside, of course, was that there were many more users in any given area of a city, so it was harder to isolate your particular suspect than, say, in farmland.

Szarnek was hoping to nail down GPS data, which was the gold standard of tracking and would give the location of the sniper to within a few feet.

Finally Sachs arrived in the general vicinity, took a turn at forty, missing both a bus and a hot dog stand by inches, and skidded to a stop on a side street off Broadway. The aroma of baking tires rose, a smell nostalgic and comforting.

She looked around at the hundreds of passersby, about 10 percent of them on their phones. Was the shooter one of the people she was peering at right now? The lean young man with the crew cut, wearing khaki slacks and a work shirt? He looked military. Or the sullen, dark-complected man who was in a badly fitting suit and looking around suspiciously from behind darkly tinted sunglasses? He looked like a hit man but might have been an accountant.