I MURDERED ISABELLA CALAIS.

The murders were a confession, and maybe Pierce was almost finished. Then what would happen? And who was S?

Was it Smith himself? Did S stand for Smith?

Would he symbolically murder Smith? Then Mr. Smith would disappear forever?

I called Kyle Craig and then Sampson, and I told them what I had found. It was past two in the morning, and neither of them was overjoyed to hear my voice or the news. They didn’t know what to do with the word jumble and neither did I.

“I’m not sure what it gives us,” Kyle said, “what it proves, Alex.”

“I don’t either. Not yet. It does tell us he’s going to kill someone with an S in his name.”

“George Steinbrenner,” Kyle mumbled. “Strom Thurmond. Sting.”

“Go back to sleep,” I said.

My head was doing loops. Sleep wasn’t an option for me. I half expected to get another message from Pierce, maybe even that night. He was mocking us. He had been from the beginning.

I wanted to get a message to him. Maybe I ought to communicate with Pierce through the newspapers or TV? We needed to get off the defensive and attack instead.

I lay in the darkness of my bedroom. Could S be Mr. Smith? I wondered. My head was throbbing. I was past being exhausted. I finally drifted off toward sleep. I was falling off the edge-when I grabbed hold.

I bolted up in bed. I was wide-awake now.

“S isn’t Smith.”

I knew who S was.

Chapter 125

THOMAS PIERCE was in Concord, Massachusetts.

Mr. Smith was here, too.

I was finally inside his head.

Sampson and I were ready on a cozy, picturesque side street near the house of Dr. Martin Straw, the man who had been Isabella’s lover. Martin Straw was S in the puzzle.

The FBI had a trap set for Pierce at the house. They didn’t bring huge numbers of agents this time. They were afraid of tipping off Pierce. Kyle Craig was gun-shy and he had every reason to be. Or maybe there was something else going on.

We waited for the better part of the morning and early afternoon. Concord was a self-contained, somewhat constrained town that seemed to be aging gracefully. The Thoreau and Alcott homes were here somewhere nearby. Every other house seemed to have a historical-looking plaque with a date on it.

We waited for Pierce. And then waited some more. The dreaded stakeout in Podunk dragged on and on. Maybe I was wrong about S.

A voice finally came over the radio in our car. It was Kyle. “We’ve spotted Pierce. He’s here. But something’s wrong, Alex. He’s headed back toward Route Two,” Kyle said. “He’s not going to Dr. Straw’s. He saw something he didn’t like.”

Sampson looked over at me. “I told you he was careful. Good instincts. He is a goddamn Martian, Alex.”

“He spotted something,” I said. “He’s as good as Kyle always said. He knows how the Bureau works, and he saw something.”

Kyle and his team had wanted to let Pierce enter the Straw house before they took him down. Dr. Straw, his wife, and children had been moved from the place. We needed solid evidence against Pierce, as much as we could get. We could lose the case if we got Thomas Pierce to court without it. We definitely could lose.

A message crackled over the shortwave. “He’s headed toward Route Two. Something spooked him. He’s on the run!”

“He has a shortwave! He’s intercepting us!” I grabbed the mike and warned Kyle. “No more talk on the radio. Pierce is listening. That’s how he spotted us.”

I started the engine and gunned the sedan away from the curb. I pushed the speed up to sixty on heavily populated Lowell Road. We were actually closer to Route 2 than the others. We still might be able to cut Pierce off.

A shiny, silver BMW passed us, coming from the opposite direction on the road. The driver sat on her horn as we sped by. I couldn’t blame her. Sixty was a dangerous speed on the narrow village street. Everything was going crazy again, caroming out of control at the whim of a madman.

“There he is!” Sampson yelled.

Pierce’s car was heading into Concord Center, the most congested area of town. He was moving way too fast.

We sped past Colonial-style houses, then upscale shops, and finally approached Monument Square. I caught glimpses of the Town House, Concord Inn, the Masons Hall-then a sign for Route 62-another for Route 2.

Our sedan whisked by car after car on the village streets. Brakes screeched around us. Other cars honked, justifiably angry and afraid of the car chase in progress.

Sampson was holding his breath and so was I. There’s a joke about black men being pulled over illegally in suburban areas. The DWB violation. Driving while black. We were up to seventy inside the city limits.

We made it in one piece out of the town center- Walden Street – Main -then back onto Lowell Road approaching the highway.

I whipped around onto Route 2 and nearly spun out of control. The pedal was down to the floor. This was our best chance to get Thomas Pierce, maybe our last chance. Up ahead, Pierce knew this was it, too.

I was doing close to ninety now on Route 2, passing cars as if they were standing still. Pierce’s Thunderbird must have been pushing eighty-five. He’d spotted us early in the chase.

“We’re catching this squirrelly bastard now!” Sampson hollered at me. “Pierce goes down!”

We hit a deep pothole and the car momentarily left the road. We landed with a jarring thud. The wound in my side screamed. My head hurt. Sampson kept hollering in my ear about Pierce going down.

I could see his dark Thunderbird bobbing and weaving up ahead. Just a couple of car lengths separated us.

He’s a planner, I warned myself. He knew this might happen.

I finally caught up to Pierce and pulled alongside him. Both cars were doing close to ninety. Pierce took a quick glance over at us.

I felt strangely exhilarated. Adrenaline powered through my body. Maybe we had him. For a second or two, I was as totally insane as Pierce.

Pierce saluted with his right hand. “Dr. Cross,” he called through the open window, “we finally meet!”

Chapter 126

“I KNOW about the FBI sanction!” Pierce yelled over the whistle and roar of the wind. He looked cool and collected, oblivious to reality. “Go ahead, Cross. I want you to do it. Take me out, Cross!”

“There’s no sanction order!” I yelled back. “Pull your car over! No one’s going to shoot you.”

Pierce grinned-his best killer smile. His blond hair was tied in a tight ponytail. He had on a black turtleneck. He looked successful-a local lawyer, shop owner, doctor. “Doc.”

“Why do you think the FBI brought such a small unit,” he yelled. “Terminate with prejudice. Ask your friend Kyle Craig. That’s why they wanted me inside Straw’s house!”

Was I talking to Thomas Pierce?

Or was this Mr. Smith?

Was there a difference anymore?

He threw his head back and roared with laughter. It was one of the oddest, craziest things I’ve ever seen. The look on his face, the body language, his calmness. He was daring us to shoot him at ninety miles an hour on Route 2 outside Concord, Massachusetts. He wanted to crash and burn.

We hit a stretch of highway with thick fir woods on either side. Two of the FBI cars caught up. They were pinned on Pierce’s tail, pushing, taunting him. Had the Bureau come here planning to kill Pierce?

If they were going to take him, this was a good place-a secluded pocket away from most commuter traffic and houses.

This was the place to terminate Thomas Pierce.

Now was the time.

“You know what we have to do,” Sampson said to me.

He’s killed more than twenty people that we know of, I was thinking, trying to rationalize. He’ll never give up.

“Pull over,” I yelled at Pierce again.

“I murdered Isabella Calais,” he screamed at me. His face was crimson. “I can’t stop myself. I don’t want to stop. I like it! I found out I like it, Cross!”