But the game changed. Headlights blazed and an engine turned. A white j.a.panese compact squealed out of a parking slot and fishtailed away from Heat toward the exit ramp. Heat rose, braced on the hood of the SUV, and squeezed off another 9. The back window of the Versa spider-veined, but the driver turned the hairpin corner and disappeared up the ramp toward ground level.

Heat raced for the stairwell.

The Nissan's horn sounded a long and constant bleat, even frying the air outside the parking garage as it zoomed up the incline from below. Pedestrians heard it and scattered on the sidewalk to either side of the entrance as it flew out of the mouth of the structure and crossed the driveway out onto Fulton.

Jameson Rook floored the Crown Victoria Police Interceptor and T-boned the Nissan Versa, broadsiding the compact when it hit the street. The impact lifted the two nearest tires half a foot off the pavement and pushed the small car sideways into the rear of a cement truck, deploying the airbag in Salena Kaye's face.

It only took seconds for Heat to rush onto the driveway, but by then Kaye had already climbed out the broken windshield. Nikki searched the block and spotted her jogging away with a limp down Fulton Street. Heat knew she could take her down at that distance, but she wouldn't put bystanders at risk to prove it.

"Pearl Street. I've got her," said Heat, running past Rook as he got out of her Crown Vic.

He called out, "Hey! I stayed with the car!" Rook couldn't be sure she heard him. Nikki had already rounded the corner. Improvising his own tactics, Rook briefed the rent-a-car manager to tell the backup which way Heat had gone, and then he ran off to take Cliff Street, the road that ran parallel to Nikki's.

"Vehicles, two minutes away," said Callan to Heat. "You should be hearing the chopper any second."

"I've lost her," she said into her cell phone. "How the h.e.l.l could I have lost her in fifteen seconds?" She gave the DHS agent Salena Kaye's clothing description and pinpointed her position on Pearl Street, scanning storefronts and nail salons, as she walked and talked. "Just get here. Get here with everything now." Then she hung up.

Rook knew the neighborhood, and his plan was to follow Cliff until it intersected with John Street, where he would, theoretically, complete a pincer movement and meet up with Nikki in the middle of the block, closing off Kaye's escape. But before he reached John Street, he glanced inside a deli window and saw her-saw Salena Kaye at the steam table trying to blend in with the crowd.

And Salena saw him clock her. She started reaching inside her jacket.

"Bomb!" shouted Rook as he rushed in. "Everybody out, now!"

Amid the screams of panic and the stampede that jostled Salena Kaye, her draw got slowed enough for him to lunge for her. Rook's momentum slammed them into the steam table and her Glock came loose, sliding across the linoleum toward the back of the deli.

Rook was more a boxer than a combat fighter, and she easily broke free of his clinch, shoved him onto the floor, and started for her weapon. But as a proud college slacker, Rook possessed a talent more formidable than jujitsu: Frisbee. From a one-kneed kneel, he picked up a plastic dinner plate and executed a perfectly flung s...o...b..r that caught Kaye behind the ear. She didn't go down, but the plate edge stunned her enough to slow her.

She turned in disbelief only to be met by a barrage of salad-bar ice he shoveled at her frantically with both hands. Salena gave him a dismissive look, turned to get her gun, but her feet shot out from under her, slipping on the ice cubes. She landed hard. With no time to run to her, Rook hurled himself on his chest, slid across the floor on a bed of cubes, grabbed her gun, and stood, holding it on her. "Citizen's arrest," he said.

Heat appeared, making her way through the crowd outside, and stood in the front doorway. "Hey, Detective," he said. "Look what I caught."

As he finished the words, Salena Kaye yanked the legs out from under him by the pant cuffs, and he toppled backward onto the floor. In a flash, she scrambled through the vertical strips of hanging vinyl leading to the kitchen. Once more, Heat couldn't chance a shot that might take out a cook or a clerk. Slowly, she picked her way through the ice cubes and followed into the kitchen. The back door stood open. Nikki brought her gun up and rolled out into the alley-and found it empty.

Heat sprinted to the end of the pa.s.sage where it opened onto Pearl Street and looked both ways. She even looked up. How did that happen?

Salena Kaye had simply vanished.

Fulton Street had become a shining river of black vehicles when Heat and Rook walked back to Surety Rent-a-Car. SUVs and sedans with muscular engines and white US government plates filled the block, which had been sealed off. Air support and TV news copters circled overhead. Forensics technicians in coveralls dusted the mangled Nissan and took photos from all angles. More of the same went on one garage level below, with the added feature of the NYPD shooting team down there to rule on Heat's judgment under fire.

Heat and Rook found Agent Callan sitting in the backseat of his Suburban with the door open and his feet on the outside running boards, talking on a secure sat-phone. The boyish quarterback look seemed to have gained some weathering. He flicked a brow greeting to them, but pulled the door closed to finish his call.

A minute later, he stepped out, pocketing his phone. "Detective Heat, we have just kicked into a new era of heartache."

Heat shook her head. "How could she have vanished off the sidewalk? I was right behind her. There's no way she could have disappeared into thin air like that."

"Yeah, well a bigger whale just hit the fry pan. I'm sure you've been kind of busy the last half hour, but have you done any of the math on this?"

"Sure I have," Nikki said.

"Come on, Callan, we all have." Rook made a perimeter check to make sure they were out of earshot of press or civilians. "Salena Kaye's part of a bioterror plot, and she comes to rent a truck."

"We can all reach the same bottom line on that," said Heat.

"Well now we have a new figure to add to the equation." The agent side-nodded to the rental office. "Manager says she wanted to rent an E-350 cargo truck for this weekend." Nikki felt herself go weak. Rook let out a low whistle. Callan continued, "That's right. I just briefed the president's national security advisor that we have a high probability of a bioterror attack in New York City. And it's as soon as three or four days away."

THIRTEEN.

Special Agent in Charge Callan didn't make it optional for Heat to join him in the Homeland Situation Room for a meeting of his Bioterror Task Force. He drew her away from Rook and said, "Listen, you will be there. And if there's some personality conflict between you and Agent Bell-"

"I think you know I'm more professional than that," she said, interrupting him. "I know what's at stake, and I would never let personal feelings interfere." And then, for his benefit, she added, "Personal feelings on any level, about anyone."

A hint of a smile, the first lightness Nikki had seen in him since his arrival on-scene, creased the corners of his mouth. "Guess we're all pros here, then."

"And given the very big clock that's counting down, I need to put my energy where it can do its best: working the street. Do I have time to b.u.t.ton up my loose ends here?"

Callan slid the cuff off his aviator-style watch as he led her back to his Suburban. "I'm jumping on this now, but if you think you can make better use of time in the field, do it. I've got people en route from the Pentagon and CDC, and they'll be joining the meeting in-progress, also."

Rook heard that and cleared his throat. Nikki said, "He can come, right?"

"I'm her wall. She bounces things off me." He raised his hand in oath. "And it's all off the record."

The agent scrutinized him. "Yes, Mr. Rook can join us, if that means you'll actually show up, Detective Heat."

"Oh, we will," said Rook.

"Parting orders?" said Agent Callan as he got in his vehicle. "Not a word about this. Not just press, Rook." He addressed them both. "Not to anyone. No mentions to sweethearts, family, friends, anybody. In this era of social media, we don't want word to spread and start a panic."

"Right," said Rook. "Who needs a viral threat to go, well, viral?"

"On second thought, Heat, leave him in the car." He slammed the door and roared off to Varick Street with the hidden emergency lights strobing in the grill of his SUV.

"You look just like on TV," said Alan Lew, manager of the Surety Rent-a-Car location. "Nothing like a police officer. You're beautiful like a model. Or Bond girl."

"Thank you, Mr. Lew. And thank you for calling in your tip. It was brave and extremely helpful."

"The picture on that Web site, FirstPress? Didn't do you justice."

"Oh, you saw the article," said Rook with a sly wink to Nikki.

"Yeah, it was OK. Good story. But the writing... not exactly Shakespeare, you know?"

Rook's smile vanished. "I think the detective has some questions for you, sir."

"We're going to keep the rental agreement she filled out, if that's all right."

"Absolutely."

"This photocopy you made is obviously of a fake ID and an alias."

"I pretended the copy machine was slow so I could stall her until you got here."

"Very resourceful. Can you tell me what she was doing during that time?"

He came around the counter and stood where Salena Kaye had been. Heat made a little sketch, out of habit, and marked the spot. Sometimes these interviews were perfunctory; sometimes they yielded clues. In her experience, motivated people like Lew made good witnesses, so Nikki paid close attention. "She was mostly right here the whole time. Looking around a lot. Watching me in the back when I called you. It took two tries to reach you, and I didn't want her to get away."

"May I?" asked Heat. Mr. Lew stepped aside, and she stood where he had and rotated. "Looked around like this?"

He nodded eagerly. "Except she was doing this." He repeated her move, but mimed holding a cell phone to his ear.

"She was on her phone. Did you hear anything she said? A name?"

The manager said, "She didn't say anything, she was just holding it."

She turned to Rook. "Go to the entrance where I came in, so I can see you coming." He trotted out to the sidewalk and walked in the garage driveway, as Nikki had. As soon as Heat saw him, she ran to the gla.s.s door and retraced Salena Kaye's route to the man lift, timing herself. She walked back to the office, looking thoughtful.

A patrol officer came in. "Excuse me, Detective? Got an eyewit."

Outside the deli on Cliff Street, a bicycle messenger said he saw Salena Kaye race off in a silver minivan. "Did you get a plate?" asked Nikki.

The eyewitness shook his head. "It didn't have any plates."

"Was she driving?"

"Some dude." He didn't get a description of the driver. "I was too focused on staying alive. Van almost creamed me, booking a.s.s out of there."

A technician from ECU had found Salena Kaye's shoulder bag under the deli steam table. Rook said, for the benefit of all in earshot, "She must have dropped it-when I took her down." Heat was too busy placing the bag's contents out on a table to pay attention.

She laid out a slim Eagle Creek travel wallet with the fake ID, a credit card in the same alias, a few hundred in cash, a popular lipstick and compact available from any drugstore, and a hotel room key with the identification tag removed. Heat also found a clip of 9mm ammunition. "A gal always needs a spare," said Nikki as she set it beside the other items. To her gloved touch, the outer pocket of the bag felt like it held another clip, but it turned out to be a cell phone. Nikki opened Recents and saw the last call received. It matched the time Kaye had been in the rental office. Using her own cell, Heat called the squad. Hinesburg picked up.

"Hey, Nikki," she said, the only one in the house who used her first name, a trait residing about midpoint on her list of annoying qualities, "did that tipster guy ever reach you?"

"You heard about him?"

"Yeah, some guy called and said he spotted Salena Kaye and wanted to talk to you. I started quizzing him to make sure he wasn't a crackpot, and he got all cranked and said he couldn't waste time and hung up on me."

Heat recalled the rental car manager saying he made two tries to reach her. "Detective, how come you didn't tell me?"

"I am." And then Hinesburg actually giggled.

"Detective."

"You mean before? I didn't bother you earlier 'cause I thought he was a nut job."

As she had so many times dealing with Sharon Hinesburg, Heat made a silent three-count before she continued. "You have a pen? Write this down." Nikki recited the Recents number from Salena Kaye's phone and asked her to run it. "And Sharon? Do call me immediately when you get the trace."

After she hung up, Heat furrowed her brow, considered the screwup potential, then pressed the speed dial for Detective Ochoa's cell. When he answered, she gave him the phone number and asked him to trace it. "And Miguel, don't let Hinesburg know you're doing this. I asked her to run it, and I'm having second thoughts about her follow-through."

"You mean just now?" He laughed and hung up.

"You think someone called and tipped Kaye off, don't you?" said Rook.

Heat continued to go through the shoulder bag. "Could be. Why do you ask?"

"Because back at the rent-a-car, when you asked me to go out and reenact walking in-playing the part of you-there's no way Salena Kaye could have spotted you without you spotting her, too."

"Not unless she has X-ray vision and saw me coming through the wall when I was on the sidewalk." She glanced up from her bag search and gave him a smile. "That's good deduction, Writer Boy."

"I walked a mile in your shoes, Nikki Heat."

"You can stop now."

"Stopping," he said.

"OK, here we go..." From a fold at the bottom of the shoulder bag she pulled out a small plastic card, about the size of a supermarket rewards chip. "Somebody joined a gym." She held up the membership card with the bar code on it so he could see. "Coney Island Workout."

Macka, the owner of the gym, paused his ch.o.r.e of rolling towels and stacking them in cubbies to scan the bar code on the infrared gun at Reception. "She bought a month-to-month. This who you're looking for?" He spun the computer flat-screen toward them. Salena Kaye's unsmiling ID photo, taken right there against the powder blue wall, stared out. But the name matched the fake credit card and license, not her real one.

"That's her," said Heat. "Do you have an address?"

"Sure do," he said and brought that file up for them to see. "It's in Fairfax, Virginia." No surprise to Heat. She turned away to scan the gym, hoping to find someone Salena worked out with-also a long shot; Kaye would be a loner and just use the facility to keep up her battle strength. Then Macka said, "But I know where she lives. You know, she's kind of a looker. I was waiting for my bus one night and saw her go in the Coney Crest on Surf Ave."

On their way there, Rook said, "Excuse me, you're not going to check in with our cousins at Homeland Security?"

Heat knew she should, but answered, "It'll slow us down," speaking the perfect brand of truth: the one that also functioned as camouflage for a deeper truth. Someone may have tipped off Salena Kaye about Heat's visit to the rent-a-car. Nikki simply would not take the chance that it could happen again, and made a field decision that this raid would be lightning-quick, minimal in size, and known solely by the actual partic.i.p.ants. She only made two calls. One to Benigno DeJesus, whose evidence collection team had finished scouring Heat's apartment, and the other to the Sixtieth Precinct to request some uniformed officers to establish a perimeter around the motel and provide backup. Detective Heat never said for what, and n.o.body asked her to. Everyone just a.s.sumed it was all about the Rainbow case.

The Coney Crest fell into that subcategory of lodging known as the SRO, or single residence occupancy-a weekly transitional rental for the increasing number of unfortunate souls who'd lost their homes in a bad economy. In police shorthand, SROs also functioned as flophouses for the marginally legal and folks hiding out: s.h.i.theads, robbers, and offenders. The thing most of these places had in common was few questions asked, bad smells in the halls, and names that sounded cla.s.sier than the joint.

As Heat walked the second-floor breezeway toward Room 210, a trio of uniforms crept up the far stairs to converge with her in the open hallway. She paused to look over the rail at the cloudy swimming pool where Rook waited beside the broken diving board. The Coney Crest's manager, no const.i.tutional scholar, never asked for a warrant. The weary man with pouched eyes simply gave Nikki his pa.s.skey, even though he pointed out that the one Heat had brought from Salena's bag would fit 210 and about a half dozen other doors in the place.

Detective Heat and the officers behind her took positions on opposite sides of the door. Using the silent signals and the plan they had worked out in the parking lot, Nikki knelt, slid the key in the lock, called, "Salena Kaye, NYPD, open up," and unlocked the door. The nearest uniform booted it open and they all rolled in, covering one another and shouting don't-move commands.

In fifteen seconds, it was over. They had cleared the bedroom, the closet, the bathroom, even searched the modest array of cabinets in the kitchenette.

"You didn't really expect her to be in here, did you?" asked Rook when she allowed him in.

"Not really. Kaye's a trained agent. She'd been burned, we had her key; she'll never come here again." She smiled at him. "But let a girl have her fantasies."

"Every wish begins with Kaye," he said.

Benigno DeJesus had no trouble finding the place. He had been to the Coney Crest so many times over the years that he'd joked to his forensics team about renting one of the rooms to keep as storage for his gear. While Heat's go-to ECU detective snapped open his rolling case out on the breezeway and prepared to examine Room 210, he filled Nikki in on the results of his run of her apartment.