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Authors: Tess Gerritsen
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Dr. Yeager’s wrists. I want to show it to you under UV. Hit that wall switch, will you?”
Rizzoli flipped the switch. In the sudden darkness, Erin’s small UV lamp glowed an eerie blue-green. It was a far less powerful light source than the Crimescope that Mick had used in the Yeager residence, but as its beam washed across the strip of tape, startling details were nonetheless revealed. Adhesive tape left behind at crime scenes can be a detective’s treasure trove. Fibers, hairs, fingerprints, even a criminal’s DNA left behind in skin cells, may adhere to tape. Under UV, Rizzoli could now see bits of dust and a few short hairs. And, along one edge of the tape, what looked like a very fine fringe of fibers.
“Do you see how these fibers at the extreme edge are continuous?” said Erin. “They run the whole length of the tape taken from his wrists, as well as from his ankles. They almost look like a manufacturer’s artifact.”
“But they’re not?”
“No, they’re not. If you lay a roll of tape on its side, the edges pick up traces of whatever the roll is lying on. These are fibers from that surface. Everywhere we go, we pick up traces of our environment. And we later leave behind those traces in other locations. So has your unsub.” Erin switched on the room lights and Rizzoli blinked in the sudden glare.
“What sort of fibers are these?”
“I’ll show you.” Erin removed the slide containing the strand of hair and replaced it with another slide. “Take a look through the teaching head. I’ll explain what we’re seeing.”
Rizzoli peered into the eyepiece and saw a dark fiber, curled into a C.
“This is from the edge of the duct tape,” said Erin. “I used forced hot air to peel apart all the various layers of the tape. These dark-blue fibers ran along the entire length. Now let me show you the cross section.” Erin reached for a file folder, from which she removed a photograph. “This is how it looks under the scanning electron microscope. See how the fiber has a delta shape? Like a little triangle. It’s manufactured this way to reduce dirt trapping. This delta shape is characteristic of carpet fibers.”
“So this is man-made material?”
“Right.”
“What about birefringence?” Rizzoli knew that when light passed through a synthetic fiber, it often came out polarized in two different planes, as though shining through a crystal. The double refraction was called birefringence. Each type of fiber had a characteristic index, which could be measured with a polarizing microscope.
“This particular blue fiber,” said Erin, “has a birefringence index of point zero six three.”
“Is that characteristic for something in particular?”
“Nylon six, six. Commonly used in carpets, because it’s resistant to stains, it’s resilient, and it’s tough. In particular, this fiber’s cross-sectional shape and infrared spectrograph match a DuPont product called Antron, used in carpet manufacture.”
“And it’s dark blue?” said Rizzoli. “That’s not a color most people would choose for a home. It sounds like auto carpet.”
Erin nodded. “In fact, this particular color, number eight-oh-two blue, has long been offered as a standard option in luxury-priced American cars. Cadillacs and Lincolns, for instance.”
Rizzoli immediately understood where this was going. She said, “Cadillac makes hearses.”
Erin smiled. “So does Lincoln.”
They were both thinking the same thing:
The killer is someone who works with corpses
.
Rizzoli considered all the people who might come into contact with the dead. The cop and the medical examiner who are called to the scene of an unattended death. The pathologist and his assistant. The embalmer and the funeral director. The restorer, who washes the hair and applies makeup, so the loved one is presentable for final viewing. The dead pass through a succession of living guardians, and traces of this passage might cling to any and all who have
Rizzoli flipped the switch. In the sudden darkness, Erin’s small UV lamp glowed an eerie blue-green. It was a far less powerful light source than the Crimescope that Mick had used in the Yeager residence, but as its beam washed across the strip of tape, startling details were nonetheless revealed. Adhesive tape left behind at crime scenes can be a detective’s treasure trove. Fibers, hairs, fingerprints, even a criminal’s DNA left behind in skin cells, may adhere to tape. Under UV, Rizzoli could now see bits of dust and a few short hairs. And, along one edge of the tape, what looked like a very fine fringe of fibers.
“Do you see how these fibers at the extreme edge are continuous?” said Erin. “They run the whole length of the tape taken from his wrists, as well as from his ankles. They almost look like a manufacturer’s artifact.”
“But they’re not?”
“No, they’re not. If you lay a roll of tape on its side, the edges pick up traces of whatever the roll is lying on. These are fibers from that surface. Everywhere we go, we pick up traces of our environment. And we later leave behind those traces in other locations. So has your unsub.” Erin switched on the room lights and Rizzoli blinked in the sudden glare.
“What sort of fibers are these?”
“I’ll show you.” Erin removed the slide containing the strand of hair and replaced it with another slide. “Take a look through the teaching head. I’ll explain what we’re seeing.”
Rizzoli peered into the eyepiece and saw a dark fiber, curled into a C.
“This is from the edge of the duct tape,” said Erin. “I used forced hot air to peel apart all the various layers of the tape. These dark-blue fibers ran along the entire length. Now let me show you the cross section.” Erin reached for a file folder, from which she removed a photograph. “This is how it looks under the scanning electron microscope. See how the fiber has a delta shape? Like a little triangle. It’s manufactured this way to reduce dirt trapping. This delta shape is characteristic of carpet fibers.”
“So this is man-made material?”
“Right.”
“What about birefringence?” Rizzoli knew that when light passed through a synthetic fiber, it often came out polarized in two different planes, as though shining through a crystal. The double refraction was called birefringence. Each type of fiber had a characteristic index, which could be measured with a polarizing microscope.
“This particular blue fiber,” said Erin, “has a birefringence index of point zero six three.”
“Is that characteristic for something in particular?”
“Nylon six, six. Commonly used in carpets, because it’s resistant to stains, it’s resilient, and it’s tough. In particular, this fiber’s cross-sectional shape and infrared spectrograph match a DuPont product called Antron, used in carpet manufacture.”
“And it’s dark blue?” said Rizzoli. “That’s not a color most people would choose for a home. It sounds like auto carpet.”
Erin nodded. “In fact, this particular color, number eight-oh-two blue, has long been offered as a standard option in luxury-priced American cars. Cadillacs and Lincolns, for instance.”
Rizzoli immediately understood where this was going. She said, “Cadillac makes hearses.”
Erin smiled. “So does Lincoln.”
They were both thinking the same thing:
The killer is someone who works with corpses
.
Rizzoli considered all the people who might come into contact with the dead. The cop and the medical examiner who are called to the scene of an unattended death. The pathologist and his assistant. The embalmer and the funeral director. The restorer, who washes the hair and applies makeup, so the loved one is presentable for final viewing. The dead pass through a succession of living guardians, and traces of this passage might cling to any and all who have
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