'Don't go getting pissed at your docs up in Fairfax,' said Marino, who seemed to read my mind. 'Fauquier County asked ATF to take over here, so that's the way it's going.'

I still didn't like it, but it was time to get on with the business at hand.

'I'm assuming no body has been recovered yet,' I said, and I was writing fast.

'Hell no. That's going to be your fun job.'

I paused, resting the pen on the call sheet. 'Marino, this is a single-dwelling fire. Even if arson is suspected, and it's a high-profile case, I'm not seeing why ATF is interested.'

'Whiskey, machine guns, not to mention buying and selling fancy horses, so now we're talking about a business,' Marino answered.

'Great,' I muttered.

'Oh yeah. We're talking a goddamn nightmare. The fire marshal's gonna call you before the day's out. Better get packed because the whirlybird's picking us up before dawn. Timing's bad, just like it always is. I guess you can kiss your vacation goodbye.'

Benton and I were supposed to drive to Hilton Head tonight to spend a week at the ocean. We had not had time alone so far this year and were burned out and barely getting along. I did not want to face him when I hung up the phone.

'I'm sorry,' I said to him. 'I'm sure you've already figured out there's a major disaster.'

I hesitated, watching him, and he would not give me his eyes as he continued to decipher Carrie's letter.

'I've got to go. First thing in the morning. Maybe I can join you in the middle of the week,' I went on.

He was not listening because he did not want to hear any of it.

'Please understand,' I said to him.

He did not seem to hear me, and I knew he was terribly disappointed.

'You've been working those torso cases,' he said as he read. 'The dismemberments from Ireland and here. Sawed-up bone. And she fantasizes about Lucy, and masturbates. Reaching orgasm multiple times a night under the covers. Allegedly.'

His eyes ran down the letter as he seemed to talk to himself.

'She's saying they still have a relationship, Carrie and Lucy,' he continued. 'The we stuff is her attempt to make a case for disassociation. She's not present when she commits her crimes. Some other party doing them. Multiple personalities. A predictable and pedestrian insanity plea. I would have thought she'd be a little more original.'

'She is perfectly competent to stand trial,' I answered with a wave of fresh anger.

'You and I know that.' He drank from a plastic bottle of Evian. 'Where did Lucy Boo come from?'

A drop of water dribbled down his chin and he wiped it with the back of his hand.

I stumbled at first. 'A pet name I had for her until she was in kindergarten. Then she didn't want to be called that anymore. Sometimes I still slip.' I paused again as I imagined her back then. 'So I guess she told Carrie the nickname.'

'Well, we know that at one time, Lucy confided in Carrie quite a lot,' Wesley stated the obvious. 'Lucy's first lover. And we all know you never forget your first, no matter how lousy it was.'

'Most people don't choose a psychopath for their first,' I said, and I still could not believe that Lucy, my niece, had.

'Psychopaths are us, Kay,' he said as if I had never heard the lecture. 'The attractive, intelligent person sitting next to you on a plane, standing behind you in line, meeting you backstage, hooking up with you on the Internet. Brothers, sisters, classmates, sons, daughters, lovers. Look like you and me. Lucy didn't have a chance. She was no match for Carrie Grethen.'

The grass in my backyard had too much clover, but spring had been unnaturally cool and perfect for my roses. They bent and shivered in gusting air and pale petals fell to the ground. Wesley, the retired chief of the FBI's profiling unit, went on.

'Carrie wants photos of Gault. Scene photos, autopsy photos. You bring them to her, and in exchange she'll tell you investigative details, forensic jewels you've supposedly missed. Ones that might help the prosecution when the case goes to court next month. Her taunt. That you might have missed something. That it might in some way be connected with Lucy.'

His reading glasses were folded by his place mat, and he thought to slip them on.

'Carrie wants you to come see her. At Kirby.'

His face was tight as he peered at me.

'It's her.'

He pointed at the letter.

'She's surfacing. I knew she would.' He spoke from a spirit that was tired.

'What's the dark light?' I asked, getting up because I could not sit a moment longer.

'Blood.' He seemed sure. 'When you stabbed Gault in the thigh, severing his femoral artery, and he bled to death. Or would have had the train not finished the job. Temple Gault.'

He took his glasses off again, because he was secretly agitated.

'As long as Carrie Grethen is around, so is he. The evil twins,' he added.

In fact, they were not twins, but had bleached their hair and shaved it close to their skulls. They were prepubescently thin and androgenously dressed alike when I last saw them in New York. They had committed murder together until we had captured her in the Bowery and I had killed him in the subway tunnel. I had not intended to touch him or see him or exchange one word with him, for it was not my mission in this life to apprehend criminals and commit judicial homicide. But Gault had willed it so. He had made it happen because to die by my hand was to bond me to him forever. I could not get away from Temple Gault, though he had been dead five years. In my mind were gory pieces of him scattered along gleaming steel rails and rats moiling out of dense shadows to attack his blood.

In bad dreams his eyes were ice blue with irises scattered like molecules, and I heard the thunder of trains with lights that were blinding full moons. For several years after I had killed him, I avoided autopsying the victims of train deaths. I was in charge of the Virginia medical examiner system and could assign cases to my deputy chiefs, and that was what I had done. Even now, I could not look at dissecting knives with the same clinical regard for their cold sharp steel, because he had set me up to plunge one into him, and I had. In crowds I saw dissipated men and women who were him, and at night I slept closer to my guns.

'Benton, why don't you shower and then we'll talk more about our plans for the week,' I said, dismissing recollections I could not bear. 'A few days alone to read and walk the beach would be just what you need. You know how much you love the bike trails. Maybe it would be good for you to have some space.'

'Lucy needs to know.' He got up, too. 'Even if Carrie's confined at the moment, she's going to cause more trouble that involves Lucy. That's what Carrie's promising in her letter to you.'

He walked out of the kitchen.

'How much more trouble can anybody cause?' I called after him as tears rose in my throat.

'Dragging your niece into the trial,' he stopped to say. 'Publicly. Splashed across The New York Times. Out on the AP, Hard Copy, Entertainment Tonight. Around the world. FBI agent was lesbian lover of deranged serial killer…'

'Lucy's left the FBI with all its prejudices and lies and preoccupations with how the mighty Bureau looks to the world.' Tears flooded my eyes. 'There's nothing left. Nothing further they can do to crush her soul.'

'Kay, this is about far more than the FBI,' he said, and he sounded spent.

'Benton, don't start…' I could not finish.

He leaned against the doorway leading into my great room, where a fire burned, for the temperature had not gotten above sixty degrees this day. His eyes were pained. He did not like me to talk this way, and he did not want to peer into that darker side of his soul. He did not want to conjure up the malignant acts Carrie might carry out, and of course, he worried about me, too. I would be summoned to testify in the sentencing phase of Carrie Grethen's trial. I was Lucy's aunt. I supposed my credibility as a witness would be impeached, my testimony and reputation ruined.