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He’s asking for an immediate teleconference.”
    “Fine. Queue it up on monitor one.”
    Gray stood, ready to leave, but Painter waved him down, then swung his chair around. His office, buried in the subterranean bunker, had no windows, but it did have three large wall-mounted plasma screens. His private windows on the world. They were presently dark, but the monitor on the left flickered to life.
    Painter found himself staring into one of the pathology labs. In the foreground stood Dr. Malcolm Jennings. The sixty-year-old chief of R&D for Sigma was dressed in surgical scrubs and had a clear plastic face-shield tilted atop his head. Behind him spread one of the pathology suites: sealed concrete floor, rows of digital scales, and in the center a body rested on the table, respectfully covered with a sheet.

    Professor Archibald Polk.
    It had taken a few calls to get his body released to Sigma versus the city’s morgue, but Malcolm Jennings was a well-regarded forensic pathologist.
    But from the grim set to the man’s lips, something was wrong.
    “What is it, Malcolm?”
    “I had to quarantine the laboratory.”
    Painter didn’t like the sound of that. “A contagious concern?”
    “No, but there is definitely a concern. Let me show you.” He stepped out of view of the camera, but his voice carried to them. “From the preliminary physical exam, I was already suspicious. I discovered patches of hair loss, eroded teeth enamel, and burns on his skin. If the man hadn’t been shot, I wager he would’ve been dead in a matter of days.”
    “What are you saying, Malcolm?” Painter asked.
    He must not have heard. The pathologist stepped back into view, but now he wore a heavier, weighted apron. He carried a device that trailed a black wand.
    Gray stood and shifted closer to the monitor.
    Dr. Jennings waved the black wand over the dead man. The device in his other hand erupted with a furious clicking. The pathologist turned to face the camera.
    “This body is radioactive.”

2
    September 5, 5:25 P.M.
Washington, D.C.
    Out in the steaming swelter again, Gray strode down the sidewalk in front of the Smithsonian Castle. The national Mall spread to the left, mostly deserted due to the heat.
    Behind Gray, crime tape still marked off the site of the afternoon’s murder. The forensics unit had finished its sweep, but the area was still locked down, under the eye of a posted D.C. policeman.
    Gray walked east along Jefferson Drive. He was shadowed by a large bodyguard, whom he was doing his best to ignore. He had not asked for any protection, especially this man. He touched the mike at his throat and subvocalized into it. “I’ve found a trail.”
    The fizzle of a reply rasped out of his wireless earpiece. Cocking his head, Gray seated it better. “Say again,” he whispered.
    “Can you follow the trail?” Painter Crowe asked.
    “Yes…but I don’t know for how long. The readings are weak.” Gray had suggested his current plan of action. He studied the device in his hand, a Gamma-Scout portable radiation detector. Its halogen-filled Geiger-Müller tube was sensitive enough to pick up trace radiation, especially when attuned to the specific strontium 90 isotope detected in Polk’s body. Gray had hoped that a residual trace signature might have been left behind, the radiological equivalent of a scent trail. And it seemed to be working.
    “Do your best, Gray. Any information on the professor’s whereaboutsthese past days could be crucial. I already have a call in to his daughter, but I’ve been unable to reach her.”
    “I’ll follow this as far as I can.” Gray continued down the sidewalk, monitoring the detector. “I’ll report in if I discover anything.”
    Gray signed off and continued alongside the national Mall. After another half block, the signal suddenly died on his device. Swearing, he stopped, retreated, and bumped into the bodyguard shadowing him.
    “Damn it, Pierce,” the man grumbled. “I just