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"Oh," Matt said.

"Your friend is a habitual user of cocaine," Washington went on, " using it in quantities that make it probable that she is on the edges of addiction to it."

Matt looked at him in surprise.

"One of the most important assets a detective can have, Officer Payne," Washington replied dryly, "is the acquaintance of a number of people who feel in his debt. Apropos of nothing whatever, I once spoke to a judge prior to his sentencing of a young man for vehicular theft. I told the judge that I thought probation would probably suffice to keep the malefactor on the straight and narrow, and that I was acquainted with his mother, a decent, divorced woman who worked as a registered nurse at Hahneman Hospital."

"Nice," Matt said.

"I suppose you know the difference between ignorance and stupidity?"

"I think so." Matt chuckled.

"A good detective never forgets he's ignorant. He knows very, very little about what's going on. So that means a good detective is always looking for something, or someone, that can reduce the totality of his ignorance."

"Okay," Matt said with another chuckle. "So where does that leave us, now that we know she's using cocaine and knew DeZego?"

"I don't have a clue-witticism intended-why either of them got shot," Washington said. "There's a lot of homicide involved with narcotics, but what it usually boils down to is simple armed robbery. Somebody wants either the drugs or the money and uses a gun to take them. The Detweiler girl had nearly seven hundred dollars in her purse; Tony the Zee had a quantity of coke-say five hundred dollars worth, at least. Since they still had the money and the drugs, I think we can reasonably presume that robbery wasn't the basic cause of the shooting."

They were at the Penn Services Parking Garage. When Matt started to pull onto the entrance ramp, Washington told him to park on the street. Just in time Matt stopped himself from protesting that there was no parking on 15^th Street.

Washington did not enter the building. He walked to the alley at one end, then circled the building as far as he could, until he encountered a chain-link fence. He stood looking at the fence and up at the building for a moment, then he retraced his steps to the front and walked onto the entrance ramp. Then he walked up the ramp to the first floor.

Three quarters of the way down the parking area, Matt saw a uniformed cop, and a moment later yellow CRIME SCENE-DO NOT CROSS tape surrounding a Dodge sedan.

"What's that?" he asked, curiosity overwhelming his solemn, silent vow to keep his eyes open and his mouth shut.

"It was a hit on the NCIC when they ran the plates," Washington said. "Reported stolen in Drexel Hill."

The National Crime Information Center was an FBI-run computer system. Detectives (at one time there had been sixteen Homicide detectives in the Penn Services garage) had fed the computer the license numbers of every car in the garage at the time of the shooting. NCIC had returned every bit of information it had on any of them. The Dodge had been entered into the computer as stolen.

"Good morning," Washington said to the uniformed cop. "The lab get to this yet?"

"They were here real early this morning," the cop said. "I think there's still a couple of them upstairs."

Washington nodded. He walked around the car and then looked into the front and backseats. Then he started up the ramp to the upper floors.

"It'll probably turn out the Dodge has nothing to do with the shooting," he said to Matt. "But we'll check it out, just to be sure."

The ramp to the roof was blocked by another uniformed cop and a cross of crime-scene tape, but when Matt and Washington walked on it, Matt saw there was only a Police Lab truck and three cars-a Mercedes convertible, roof up; a blue-and-white; and an unmarked car-on the whole floor.

He could see a body form outlined in white, where Penny Detweiler had been when he had driven on the roof and where he had found the body of Anthony J. DeZego. It seemed pretty clear that the Mercedes was Penny's car.

But where was DeZego's?

A hollow-eyed man came out of the unmarked car, smiled at Washington, and offered his hand.

"You are your usually natty self this morning, Jason, I see," he said.

"Is that a touch of jealousy I detect, Lieutenant?" Washington replied. "You know Matt Payne? Matt, this is Lieutenant Jack Potter, the mad genius of Forensics."

"No. But what do they say? 'He is preceded by his reputation'? How are you, Payne?"

"How do you do, sir?"

"Anything?" Washington asked.

"Not much. We picked up some shotshell pellets and two wads, either from off the floor or picked out of the concrete. No more shell casings. Which means that the shooter knew what he was doing; or that he had only two shells, which suggests it was double-barrel, as opposed to an autoloader; or all of the above."