When Davidson and Vaughan showed up, the director was there, along with the company’s corporate counsel, who quickly and repeatedly pointed out that their cooperation was in no way an indication of liability on their part. Rather, in the interest of being a good corporate citizen, Yellow want to help in the investigation in any way it could.

Davidson gave them a list of things he wanted, and within the hour he and Vaughan left Yellow Cab not only with Nasiri’s personnel file, but also with the dispatch logs and GPS coordinates that placed his cab right in the vicinity of the accident that evening.

They were golden. Now all they needed to do was collar Nasiri. Vaughan didn’t need to subpoena the phone records of the three stooges at the Crescent Garage, as he had taken to referring to Fahad, Jamal, and Ali Masud, to know that Nasiri had already been tipped off. If they were willing to fabricate a new logbook to protect him, there was no question that they would call and warm him that the police were closing in.

The question at this point was whether Nasiri was still in Chicago. For all they knew, he had hotfooted it back to Pakistan. And if that was the case, their investigation was as good as dead.

With his address in hand, they drove to Nasiri’s heavily Pakistani Devon Avenue neighborhood on Chicago’s north side. As it was Saturday, the sidewalks and streets were crowded with people doing their shopping. Cars were double-parked and those that were moving were committing so many traffic violations, Vaughan and Davidson could have handed out tickets all day long.

As a car blew a stop sign and almost hit them, Davidson commented, “Some day, I’m going to read the Qur’an. But if I’ve learned anything in the Public Vehicles Division it’s that it doesn’t contain anything about the proper operation of a motor vehicle.”

Vaughan chuckled and kept his eyes peeled for Nasiri’s cab. The neighborhood looked like any other immigrant neighborhood in the city. People dressed differently and he couldn’t read any of the signs. He didn’t feel here the way he did in other immigrant neighborhoods. He was an obvious outsider. He could read that in the people’s faces and it was more than just about being a cop. This world was alien to him, much the way Iraq had been. The culture couldn’t have been any more different from his own. It wasn’t like driving through Chicago’s Polish or Mexican neighborhoods. This one put him on edge and he didn’t like it. It was how he had felt when they operated outside the wire in Iraq. He wasn’t supposed to feel like that here in America. The little voice inside his head, the same one that had told him something wasn’t right on that assignment in Tikrit, was trying to tell him something again. But it wasn’t clear enough for him to understand. He wondered if maybe he was just being stupid. This wasn’t Iraq, after all. This was Chicago.

Shaking it off, he refocused on the search for Nasiri’s vehicle. Two blocks later, they found it.

“This means he’s gotta be close, right?” said Davidson as he pulled over to the curb. “Should we hit the apartment now?”

“First things first,” replied Vaughan as he reached into the bag he’d brought along and removed two black triangles about five inches long and three inches high.

“What are those?”

“SWAT chocks,” he said, pulling back the tented part to show the Public Vehicles officer the spikes underneath. “If we miss him or he tries to run, he won’t get very far with a flat tire.”

Davidson laughed. “Did they teach you that little trick in the organized Crime Division?”

“I was on SWAT before I landed at OC.”

“I heard you did intel work in Iraq. Why aren’t you in the Intelligence Division here?”

Vaughan shrugged. “You know how things work. A, there’s got to be a slot and B, you have to have impressed someone enough that they’ll go to bat for you.”

“So in other words, ass-kissing isn’t your forte?”

“Not exactly. No.”

“You just don’t try hard enough. All you have to do is put your lips together and-”

Davidson closed his eyes to demonstrate and Vaughan held up his hand to stop him. “I get it,” he said as he zipped up his bag and reached for the door handle.

“I’ll keep the car running. Just in case he comes out before you’re done and you have to chase him.”

Vaughan was tempted to flip the man the finger, but he didn’t think he knew him well enough yet. “Let’s get a patrol car to back us up on the arrest.”

Davidson nodded and picked up his radio.

“I also want to impound the cab, so let’s get a flatbed too. Once we have it impounded, we can have forensics go to work on it.”

“Aye, aye, Captain.”

Vaughan walked back to the cab and did a slow loop around it. The bodywork was pristine, right down to the shiny new rivet holding the medallion in place on the hood. The interior was clean and contained no items of any personal nature other than a beaded seat cover. He placed his chocks. One went in front of the rear passenger tire and another behind the front passenger tire. This way, whether Nasiri pulled straight out or backed out of his space, they’d be covered.

The chocks set, he walked back up to Davidson’s Bronco and got back in. “What’s the ETA on the patrol unit?”

“They’re about two blocks away,” replied the Public Vehicles officer. “Where do you want them?”

“Somewhere in front of the building, but not directly in front. Let’s not tip our hand until we have to.”

Davidson radioed the instructions to the patrol unit.

“He’s in the third-floor rear apartment,” said Vaughan as he checked the file once more. “We’ll go through the alley.”

Davidson moved his truck to a better spot and then the two men climbed out. They were both wearing plain clothes and tried to act natural, but they stood out like a couple of sore thumbs in Chicago’s de facto Little Pakistan.

“Man, I must look really good today,” quipped Davidson as he noticed people staring at him. “What do you think? Do I have my mojo working or what? This has got to be what it’s like for Brad Pitt when he goes out, huh?”

Vaughan wasn’t paying attention to his colleague. As a cop, he was always careful, always aware of his surroundings, but there was something about Nasiri and this neighborhood that put him on edge. He knew these were Pakistanis and not Iraqis, but nevertheless, he had clicked into his Iraq mode. It was a heightened sense of awareness and almost hypervigilance. It bordered on paralyzing.

He moved slower than he normally would. Davidson noticed and shortened up his stride to keep next to him. “You all right?” he asked.

Vaughan nodded. He scanned apartment windows for spotters and checked the rooftops for kids who might give away their approach via cell phones. He looked for the LOPs-the little old people who were always used as watchdogs. Thank goodness there were no shops along this street. Shopkeepers in Iraq were notorious spies.

It was all stupid and he knew it, yet he couldn’t stop himself. Every day in Iraq he had honed the skills that had kept him alive while other men had been killed and had come home in boxes. Once developed, those instincts don’t disappear. But why were they flooding back now? My God, he thought. I’ve got PTSD.

“You still want to do this?” asked Davidson as they reached the alley and Vaughan stood still on the sidewalk.

He coughed and shook it off. “I’m good to go. Let’s do it.”

The men entered the alley and came up behind Nasiri’s residence. It was a four-story brick building with a wooden set of stairs. There was a chain-link fence separating the property from the alley. Its gate was unlocked.

“So far so good,” said Davidson as he pushed it open and walked down the narrow gangway toward the stairs.

As they climbed, Vaughan had an inexplicable urge to pull out his gun. He didn’t. Nasiri was the driver responsible for a hit-and-run accident. They weren’t about to pop Osama bin Laden. Nevertheless, his hands were sweaty and his heart was pumping harder than it should have been. PTSD, anxiety attack, or whatever this feeling was, he didn’t like it.