Inside the airport terminal, it was reasonably busy. Men and women in dark raincoats walked quickly from one place to another. Harper collected two coach tickets from the United desk and carried them over to the check-in counter.

“We could use some legroom,” she said to the guy behind the counter.

She used her FBI pass for photo ID. She snapped it down like a poker player completing a flush. The guy hit a few keys and came up with an upgrade. Harper smiled, like she was genuinely surprised.

First class was half-empty. Harper took an aisle seat, trapping Reacher against the window like a prisoner. She stretched out. She was in a third different suit, this one a fine check in a muted gray. The jacket fell open and showed a hint of nipple through the shirt, and no shoulder holster.

“Left your gun at home?” Reacher asked.

She nodded. “Not worth the hassle. Airlines want too much paperwork. A Seattle guy is meeting us. Standard practice is he’d bring a spare, should we need one. But we won’t, not today.”

“You hope.”

She nodded. “I hope.”

They taxied on time and took off a minute early. Reacher pulled the magazine out and started leafing through. Harper had her tray unfolded, ready for breakfast.

“What did you mean?” she asked. “When you said it’s a clue in itself?”

He forced his mind back an hour and tried to remember.

“Just thinking aloud, I guess,” he said.

“Thinking about what?”

He shrugged. He had time to kill. “The history of science. Stuff like that.”

“Is that relevant?”

“I was thinking about fingerprinting. How old is that?”

She made a face. “Pretty old, I think.”

“Turn of the century?”

She nodded. “Probably.”

“OK, a hundred years old,” he said. “That was the first big forensic test, right? Probably started using microscopes around the same time. And since then, they’ve invented all kinds of other stuff. DNA, mass spectrometry, fluorescence. Lamarr said you’ve got tests I wouldn’t believe. I bet they can find a rug fiber, tell you where and when somebody bought it, what kind of flea sat on it, what kind of dog the flea came off. Probably tell you what the dog’s name is and what brand of dog food it ate for breakfast.”

“So?”

“Amazing tests, right?”

She nodded.

“Real science-fiction stuff, right?”

She nodded again.

“OK,” he said. “Amazing, science-fiction tests. But this guy killed Amy Callan and beat all of those tests, right?”

“Right.”

“So what do you call that type of a guy?”

“What?”

“A very, very clever guy, is what.”

She made a face. “Among other things.”

“Sure, a lot of other things, but whatever else, a very clever guy. Then he did it again, with Cooke. Now what do we call him?”

“What?”

“A very, very clever guy. Once might have been luck. Twice, he’s damn good.”

“So?”

“Then he did it again, with Stanley. Now what do we call him?”

“A very, very, very clever guy?”

Reacher nodded. “Exactly.”

“So?”

“So that’s the clue. We’re looking for a very, very, very clever guy.”

“I think we know that already.”

Reacher shook his head. “I don’t think you do. You’re not factoring it in.”

“In what sense?”

“You think about it. I’m only an errand boy. You Bureau people can do all the hard work.”

The stewardess came out of the galley with the breakfast trolley. It was first class, so the food was reasonable. Reacher smelled bacon and egg and sausage. Strong coffee. He flipped his tray open. The cabin was half-empty, so he got the girl to give him two breakfasts. Two airline meals made for a pleasant snack. She caught on quick and kept his coffee cup full.

“How aren’t we factoring it in?” Harper asked.

“Figure it out for yourself,” Reacher said. “I’m not in a helpful mood.”

“Is it that he’s not a soldier?”

He turned to stare at her. “That’s great. We agree he’s a really smart guy, and so you say well, then he’s obviously not a soldier. Thanks a bunch, Harper.”

She looked away, embarrassed. “I’m sorry. I didn’t mean it like that. I just can’t see how we’re not factoring it in.”

He said nothing in reply. Just drained his coffee and climbed over her legs to get to the bathroom. When he got back, she was still looking contrite.

“Tell me,” she said.

“No.”

“You should, Reacher. Blake’s going to ask me about your attitude.”

“My attitude? Tell him my attitude is if a hair on Jodie’s head gets hurt, I’ll tear his legs off and beat him to death with them.”

She nodded. “You really mean that, right?”

He nodded back. “You bet your ass I do.”

“That’s what I don’t understand. Why aren’t you feeling a little bit of the same way about these women? You liked Amy Callan, right? Not the same way as Jodie, but you liked her.”

“I don’t understand you, either. Blake wanted to use you like a hooker, and you’re acting like he’s still your best buddy.”

She shrugged. “He was desperate. He gets like that. He’s under a lot of stress. He gets a case like this, he’s just desperate to crack it.”

“And you admire that?”

She nodded. “Sure I do. I admire dedication.”

“But you don’t share it. Or you wouldn’t have said no to him. You’d have seduced me on camera, for the good of the cause. So maybe it’s you who doesn’t care enough about these women.”

She was quiet for a spell. “It was immoral. It annoyed me.”

He nodded. “And threatening Jodie was immoral, too. It annoyed me.”

“But I’m not letting my annoyance get in the way of justice.”

“Well, I am. And if you don’t like that, tough shit.”

THEY DIDN’T SPEAK again, all the way to Seattle. Five hours, without a word. Reacher was comfortable enough with that. He was not a compulsively sociable guy. He was happier not talking. He didn’t see anything odd about it. There was no strain involved. He just sat there, not talking, like he was making the journey on his own.

Harper was having more trouble with it. He could see she was worried about it. She was like most people. Put her alongside somebody she was acquainted with, she felt she had to be conversing. For her, it was unnatural not to be. But he didn’t relent. Five hours, without a single word.

Those five hours were reduced to two by the West Coast clocks. It was still about breakfast time when they landed. The Sea-Tac terminals were filled with people starting out on their day. The arrivals hall had the usual echelon of drivers holding placards up. There was one guy in a dark suit, striped tie, short hair. He had no placard, but he was their guy. He might as well have had FBI tattooed across his forehead.

“Lisa Harper?” he said. “I’m from the Seattle Field Office.”

They shook hands.

“This is Reacher,” she said.

The Seattle agent ignored him completely. Reacher smiled inside. Touché, he thought. But then the guy might have ignored him anyway even if they were best buddies, because he was pretty much preoccupied with paying a whole lot of attention to what was under Harper’s shirt.

“We’re flying to Spokane,” he said. “Air taxi company owes us a few favors.”

He had a Bureau car parked in the tow lane. He used it to drive a mile around the perimeter road to General Aviation, which was five acres of fenced tarmac filled with parked planes, all of them tiny, one and two engines. There was a cluster of huts with low-budget signs advertising transportation and flying lessons. A guy met them outside one of the huts. He wore a generic pilot’s uniform and led them toward a clean white six-seat Cessna. It was a medium-sized walk across the apron. Fall in the Northwest had brighter light than in D.C., but it was just as cold.

The interior of the plane was about the same size Lamarr’s Buick had been, and a whole lot more spartan. But it looked clean and well maintained, and the engines started first touch on the button. It taxied out to the runway with the same sensation of tiny size Reacher had felt in the Lear at McGuire. It lined up behind a 747 bound for Tokyo the way a mouse lines up behind an elephant. Then it wound itself up and was off the ground in seconds, wheeling due east, settling to a noisy cruise a thousand feet above the ground.