"We're in," Kidd said.

KIDD, LAUREN, AND JACKSON lived in the original oversized unit, which had a long living room overlooking the river and the Port of St. Paul, and a couple of bedrooms and bathrooms; and Kidd used the other two units as studio and computer work space. He still did some computer-related consulting, he said, as Lucas followed him back to the computer space, though ninety percent of his time was now spent painting.

Lucas stuck his head into the studio-Kidd had three landscapes under way-and then asked, "Lauren doesn't work?"

"Not so much, anymore," Kidd said. "Pretty much a full-time mom."

"What'd she do when she was working?"

"Insurance adjuster," Kidd said.

His computer desk was an old oaken library table, ten or twelve feet long, with a half-dozen computers scattered down its length. Three printers sat on an adjacent table, and a heap of cameras sat next to them. He said, "Let's see what we've got here."

LUCAS CONSIDERED HIMSELF computer literate in the sense that he could hook up computers and printers and Wi-Fi systems, and that he could use Microsoft Word, Excel, and Access, and Google and a few other programs; and he'd once owned a software company, though he had nothing to do with coding the software.

But he had no idea what Kidd was doing, other than whistling while he worked. Kidd started by plugging ICE's hard drive into an unbranded desktop computer. He brought the system up, poked at some keys, looked at some numbers, then wandered across the workshop to a bin full of DVDs, flipped through them, chose one, brought it back, and loaded it into the computer.

"What's that?" Lucas asked.

"It's an inventory program. It searches for certain kinds of apps and ... whoops. There we are."

"What?"

"I don't know. Let's look at it."

Kidd's fingers rattled on his keyboard, and a program popped up in reader form. Lauren came in, looked at Lucas, and raised an eyebrow, and he shrugged. Lucas knew nothing about the program, except that it wasn't very long.

After reading through it, Kidd said, "If this is what it looks like, you're right-Smalls didn't do it."

It was too fast. Lucas was astonished: "What is it?"

"Watch." Kidd pulled the DVD out of the computer, restarted the machine, and when it was up, rattled his fingers across the keyboard again. The screen instantly went blank.

"Good work," Lauren said.

They looked at the blank screen for a moment, then Kidd reached out, picked up a computer manual, and dropped it on the keyboard. A pornographic picture popped up.

"Aw, that's rotten," Lauren said. "Kids."

"That's the file," Lucas said. "How'd you do that?"

"Somebody wrote a little script-"

"A script?"

"Not even a program," Kidd said. "Just a few lines of shell commands." He paused. "How technical do you want this?"

"Just tell me what it does," Lucas said.

"What it does is, it tells the computer, 'If someone presses these keys all at the same time, show these photos.' It's more complicated than that, but it's not ... mmm ... complex."

"Show me."

"Well, first, you have to get the script and the porn file-it's actually a bunch of files, but they're stored in a wrapper format-on the computer. That's the tricky bit. You have to run the script once-just type the name or double-click it-and it installs itself so it starts on bootup."

"Like a virus," said Lucas.

"Not really. You have to do it intentionally. A virus would do it by itself. Anyway, if the script is running, it's just waiting for you to press four keys: QW with one hand, and OP with the other. If you do that, it sends the porn file to the default photo viewer-that's actually called Photo Viewer in this case. It also activates the screensaver. The next person who touches the keyboard or the mouse cancels the screensaver and, presto. Porn right in your face."

Kidd held the four keys and the screen blacked out. "The porn is floating under there. If I hit anything to cancel it, the porn's right there. But. If I hit the escape key, and only the escape key ..."

He did it, and they were back at the Windows home screen. He tapped on the keyboard, and nothing more happened.

"What you have is a script that will take you right to the porn, blank the screen, and set it up for instant retrieval," Kidd said. "But if you need to ditch the program, you hit the escape key-specifically the escape key and nothing else. I can think of no earthly reason to set that up, if you were just looking at the porn. The only reason to do it ..."

"Would be to set up a booby trap," Lucas finished. "But-wouldn't any computer investigator find that? The script? I mean, as soon as that turned up ..."

Kidd looked at him and said, "No."

"No?"

"No, they wouldn't find it. My tool here chased it down. The script itself is actually fairly well hidden. My tool found it because it's not part of any standard Windows boot protocol," he said. "Here's another thought. Whoever did this, whoever wrote and installed this script, knows his or her way around coding. This is a very tight little piece of work. I don't think it's something a politician would write, unless he came out of the computer industry."

"You said his or her. You italicized the her."

"ICE could do it-she could write this in four minutes," Kidd said.

Lucas thought about it for a second, then said, "Nah."

"Okay."

LAUREN SAID, "WAIT A MINUTE. You're moving too fast. If this guy is like a ... thrill freak ... then he might get off looking at porn while there are other people across the desk. Then if he needed to dump it really fast, he could do it. One touch ..."

Kidd shook his head. "I see what you're saying, but it doesn't feel like that to me. That feels backwards. He's got this complicated four-key press to get the file up ... but he doesn't need to do that. If you know the file is there, you can bring it up fast enough. Just like any work file. But the script is designed to bring it up and simultaneously hide it. Why is that?"

Lucas and Lauren both shrugged, and Kidd said, "Because it was designed so that somebody could go into his office for a few seconds and bring it up as a booby trap."

Kidd continued: "If he was only out for thrills, he'd probably just bring it up the regular way. No reason not to. Then he'd write the script so that any key would kill it. If he was getting his thrills by looking at it in his office, with other people present, and then somebody unexpectedly stepped behind his desk, he'd want to kill it with any key. Now, you kill it with the escape key. But if you needed to kill it in a big hurry, you wouldn't want to have to reach out and hit the escape key-specifically the escape key-and nothing else, to kill it. You could fumble that."

They all thought about that for a while, then Lauren said, "Maybe."

"Find something else," Lucas said, flicking his fingers at the computer.