"Power?"

"Exactly." I jumped as my cell phone rang. The ID said "Andrew Fielding." I pressed SEND. "Lu Li? Has something happened?"

"Nothing happen," Lu Li replied in a shaky voice. "I worry about Maya. I think I hear noises outside. You bring her back, Dr. David."

The bichon stopped sniffing the ground, looked up at me, and cocked its head as though listening.

"We're coming. Right now."

"Is she all right?" Rachel asked as I ended the call.

"Yes. She wants us to come back, but we're going to wait a bit."

"Why?"

"Because the NSA heard that call. If they have people in the woods, they'll probably move now. And we'll hear them."

Rachel glanced anxiously at the wall that separated us from the trees. "Do you really think there's someone out there?"

"That's not what scares you," I said. "What scares you is that now you think there might be."

She slid off the stage and looked at the door we'd passed through. It was easy to imagine someone waiting behind it.

"You said Fielding was murdered because you and he resisted the project. How exactly did you resist it?"

"We didn't just resist it. We stopped it cold. Suspended it, anyway. Fielding was the driving force, but it took me interceding with the president to accomplish it. It was like trying to stop the work on the atomic bomb during World War Two."

"Why did you want to stop it?"

"I'm not completely sure about Fielding's reasons. I think he kept a lot from me-to protect me. I mean. But my reasons were simple.

"Six months ago, we tested the Super-MRI machine. We used animals first, and there were no problems. The first humans to be scanned were the six of us in the inner circle. Within a week, we all developed strange neuro¬logical symptoms. Side effects from exposure to the machine. Fielding believed-"

"MRI doesn't cause side effects," Rachel broke in.

"Not the machines you use. But the magnetic fields generated by the Trinity MRI are exponentially more intense than those in present-day machines. They use super¬conducting materials that allow massive pulses-"

Maya was growling deep in her throat and looking up the slope of stone seats. I hadn't heard anything in the woods, but maybe the dog had. I put the tape recorder in my pocket, picked up Maya, then drew my gun and pulled Rachel through the stage door.

Darkness enveloped us.

"Stay right behind me," I said, ducking under a branch.

"Did you hear something?"

"No."

If I hadn't had Rachel with me, I would have used stealth to safely reach the house. But speed was the only option now. I plowed through the underbrush, warning Rachel whenever I hit branches likely to whip back into her face. She cried out twice and stumbled once, but she got back up and somehow managed to stay on my heels. As we neared the house, I saw the yellow square of Fielding 's patio doors. Lu Li stood silhouetted inside them, a perfect target. The image made me shiver.

When she slid open the door, I pulled her deep into the room. Maya barked wildly until Lu Li bent and held out her arms. The dog leapt into them as Rachel closed the glass door.

"Call a taxi," I whispered over my shoulder.

Rachel went to the phone.

Lu Li's eyes were wet. I touched her elbow, and the dog snapped at me. "I wish I could stay the night with you," I said quietly, "but that would look more suspicious than my going home. I'm going to go to work tomorrow and try to get some answers, so I want everything to look as normal as possible. Do you understand?"

"Yes."

"I'll take Andrew's box of toys with me. I don't want anyone to find it here. Is that all right?"

Lu Li nodded, stroking the bichon as lovingly as she would a child.

"I'm going to pull into the garage when I leave, so no one sees me take the box. If anyone asks you what I was doing here, tell them it was a sympathy visit. If they somehow overheard some of our conversation, just act like what you are. A distraught widow."

"What means distraught?"

"Grief-stricken. Grieving."

She smiled bravely. "I no need to act this."

I laid my hands on her shoulders and squeezed, then spoke almost inaudibly. "In the FedEx letter Andy sent me, there was some white powder. Almost like sand. It's in those plastic bags on the couch. Do you know any¬thing about that?"

Lu Li's gaze went to the couch, and her face wrinkled in confusion. "No. Nothing."

"Did you drop it off at the FedEx box?"

"Yes. How you know?"

"It doesn't matter." I knew Lu Li had dropped off the envelope because I had been inside Fielding's head dur¬ing my last dream. I felt a sudden compulsion to get out of the house. "Rachel? The taxi?"

"Any minute," she said from behind me.

"I want you to go into the garage," I told Lu Li. "When you hear me tap the horn, open the door for me. After I pull in, close the door."

"Okay." She left the room without a word.

I picked up the Ziplocs, then led Rachel to the dark¬ened living room, where wide windows looked onto the street. I dropped the Ziplocs on a chair, then sat on a sofa opposite the window to wait for the cab.

"Is the taxi for me?" she whispered, sitting beside me.

"Yes."

"But my car's parked at your house."

"You don't want to go back to my house. You can get it in the morning if you want to. I'd rather you take a taxi to work."

"Did I hear you tell Lu Li you're going back to work tomorrow?"

"If I don't hear from the president tonight, I am."

"Why? If they killed Fielding, why won't they kill you, too?"

Her question gave me a perverse satisfaction. "It sounds like you're buying into my delusion."

Her lips tightened, and I could see that she was gen¬uinely afraid.

"Look, if they really wanted to kill me, I'd be dead already. And if they decide to kill me before tomorrow, nothing will stop them. But I think they're too worried about how the president would react to try that. If I'm alive tomorrow morning, it's all right for me to go in."

Rachel sighed and rubbed her temples with her fingers.

"I don't know what's going to happen," I whispered. "If anyone questions you, tell as much truth as you can. You came to my house because I missed three sessions. I got a call from the wife of a friend who died today. She has no family here, so you offered to help console her. We calmed her down and walked her dog. That's all you know."

She studied my face in the dim light. "This isn't what I expected."

"I know. You really thought I was crazy."

She bit her lip, the gesture almost girlish. "I suppose I did. Part of me hoped I was wrong. But now I'm fright¬ened. I know about psychiatric problems. This is some¬thing else."

I pulled her close and spoke into her ear. "I want you to forget it all. Unless something happens to me. Then you remember. Remember and scream to high heaven." I pulled back and looked into her eyes. "I won't be com¬ing back to your office."

She stared at me as though I'd said, "We're never going to see each other again," which deep down was what I felt.

"David-"

"Here's your taxi." I stood as headlights rolled to a stop in front of the house, looking close to make sure there was a taxi light on the roof.

She was shaking her head, almost helplessly.

"Don't worry," I said. "I'm going to be fine. You've helped a lot."

"I didn't do a damned thing for you."

I pulled her out of sight of the window, then took the recorder from my pocket, removed the tape, and put it in her hand. "If you want to help, here's your chance." I started to send her on, then hesitated. "There is one more thing you could do."

"Tell me."

I pointed to the Ziploc bags on the chair. "Is there someone at Duke who could safely test that powder for infectious agents and poisons?"

"Of course. There are guys over there who live for that kind of thing."