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A search of DMV records revealed 423 owners of tan Explorers in the metropolitan area. They cross-referenced the list against warrants and found only two: a man in his sixties, wanted as a scofflaw for dozens of parking tickets, and a younger man busted for selling coke. He wondered if this was the Watchmaker's assistant but it turned out he was still in jail for the offense. The Watchmaker might well be among the remaining names on the list but there was no way to talk to every one, though Sellitto was going to have someone check those whose addresses were in lower Manhattan. There'd also been a few hits on the Emergency Vehicle Locator but none of the drivers' descriptions fit those of the Watchmaker or his partner.
Sachs had collected samples of trace from the shop itself and found that, yes, the soil and fish protein, in the form of fertilizer, had indeed come from Joanne's. There was some inside the building but Sachs had also found considerable amounts outside, in and around discarded bags of the fertilizer.
Rhyme was shaking his head.
"What's the problem?" Sellitto asked.
"It's not the protein itself. It's the fact it was on the second victim. Adams."
"Because?"
"It means the perp was checking out the workshop earlier--presumably the victim and looking for alarms or security cameras. He's been staking out his locations. Which means there's a reason he's picking these particular victims. But what the hell is it?"
The man crushed to death in the alley wasn't apparently involved in any criminal activities and had no enemies. The same was true with Joanne Harper. And she'd never heard of Adams--no link between them. Yet they'd both been targeted by the Watchmaker. Why them? Rhyme wondered. An unknown victim at the pier, a young businessman, a florist . . . and seven others to go. What is there about them that's driving him to kill? What's the connection?
"What else did you find?"
"Black flakes," Cooper said, holding up a plastic envelope. Inside were dots like dried black ink.
Sachs said, "They were from where he got the wire spool and where he was probably hiding. Also, I found a few of them outside the front door where he'd stepped on the glass running to the Explorer."
"Well, run them through the GC."
Cooper fired up the gas chromatograph/mass spectrometer and loaded a sample of the flakes. In a few minutes the results came up on the screen.
"So, what do we have, Mel?"
The tech shoved his glasses higher on his nose. He leaned forward. "Organic . . . Looks like about seventy-three percent n-alkanes, then polycyclic aromatic hydrocarbons and thiaarenes."
"Ah, roofing tar." Rhyme squinted.
Kathryn Dance gave a laugh. "You know that?"
Sellitto said, "Oh, Lincoln used to wander around the city collecting everything he could find for his evidence databases. . . . Must've been fun going out to dinner with you, Linc. You bring test tubes and bags with you?"
"My ex could tell you all about it," Rhyme replied with an amused grunt. His attention was on the black spots of tar. "I'll bet he's been checking out another victim from a place that's getting a new roof."
"Or maybe they're reroofing his place," Cooper offered.
"Doubt he's spending time enjoying cocktails and the sunset on his own roof in this weather," Rhyme replied. "Let's assume it's somebody else's. I want to find out how many buildings are being reroofed right now."
"There could be hundreds of them, thousands," Sellitto said.
"Probably not in this weather."
"And how the hell do we find them anyway?" the rumpled detective asked.
"ASTER."
"What's that?" Dance asked.
Rhyme recited absently, "Advanced Spaceborne Thermal Emission and Reflection Radiometer. It's an instrument and data package on the Terra satellite--a joint venture between NASA and the Japanese government. It captures thermal images from space. Orbits every . . . what, Mel?"
"About ninety-eight minutes. But it takes sixteen days to cover the entire Earth."
"Find out when it was over New York most recently. I want thermal images and see if they can delineate heat over two hundred degrees--I imagine tar's at least that temperature when it's applied. Should narrow down where he's been."
"The whole city?" Cooper asked.
