serial arsonists have signaturesâa very specific way of going about things. Sometimes even down to the pour patterns for accelerants, or the ways they try to disguiseâor not disguiseâthe fact that itâs a set fire, even down to using specific kinds of batteries in electronic timing devices. Darker stuff, too, speaking of marking your territory. Thrill arsonists sometimes leave DNA at fire scenesââ
âDNA?â Gault said. âI donât understand.â
âThey masturbate,â Mancini said. âOr they take a crap.â
âOr both,â Wells said. âIf theyâre having a really good time. The point is that if you know what to look for, you can read an arsonistâs signature, even if his methods evolve somewhat over time.â
Gault ran a bony finger under her nose. âAnd?â she said.
âAndâthe shed fire and the condo fire have very similar signatures. Use of liquid accelerant, line of accelerant out the door, no matches or containers left on the scene, all pretty deliberate and organized, no apparent DNA, nothing too weird or pathological, beyond the fires themselves. Simpleâarson 101âbut very similar. The probability that the two fires are set by the same person is pretty high. Unless.â
âOh, for Christâs sake,â Mancini said. âUnless what ?â
âUnless,â Coffin said, âthe person who set the second fire knew how to read the signature of the first fire.â
âRight,â Wells said, âand youâd probably have to have at least a little training in forensic fire investigation to be able to do that.â
âAnd who gets this kind of training?â Gault said.
âFirefighters,â Coffin said. âProfessional and certified volunteer. Some law-enforcement people. Academics in the field.â
âAh,â Gault said, swallowing. âI see.â
âBut like I say, the odds are very good that we have a single firebug, and not a copycat,â Wells said.
âIâd feel better about those odds if Rudy fucking Santos wasnât involved,â Mancini said.
You and me both, Coffin wanted to say, but he kept his mouth shut.
Â
Chapter 9
Coffin leaned back in his office chair, loosened his tie and unbuttoned his collar. His neck felt sore and constricted, as though a noose had been cinched around it. He rubbed it, cradling the phone in his other hand. âDr. Sengupta,â he said. âFour forty-five. Right.â
âLabs anytime before noon. Youâre supposed to fast for twelve hours. Have you eaten anything yet?â
âNope,â Coffin said. âJust coffee.â
âTheyâre squeezing you in. Donât be late.â Jamieâs voice sounded distant, thin. The phone made a faint whooshing sound that seemed to get louder whenever the wind blew particularly hard against the windows.
âWhat happened to Dr. Frankel? I liked her.â
âShe left,â Jamie said. âFive years ago.â
âI hope it wasnât something I said.â
Jamie laughed. âItâs good that weâre doing this. You need to be in tip-top shape if youâre going to chase a toddler around, you know.â
âRight,â Coffin said. âTip-top.â
âListen, itâs getting late. If youâre going to get your blood drawn in time, youâd better go now.â
âRight-o,â Coffin said. âIâll run right over.â
âLove you, Frank.â
âLove you, too.â
Coffin hung up, punched the intercom button. âArlene?â he said.
Arlene was the secretary Boyle had brought in. She was very skinny and very tan, and smelled of menthol cigarettes. She looked slightly scorched, as though sheâd been overroasted in a big oven; Coffin guessed that she spent a lot of time in tanning salons.
âYes, Chief,â she said.
âMy cousin Tonyâs the
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