‘Perhaps because he knew the effect it would have,’ I replied. ‘I would see it in the morgue and instantly know that Brown was murdered and Gault was involved.’

‘But what you’re saying is that Gault isn’t CAIN. You’re saying that Carrie Grethen is,’ Marino said.

It was Lucy who spoke. ‘Neither of them is CAIN. They are spies.’

We were silent for a moment.

‘Obviously,’ I said, ‘Carrie has continued helping Gault with the FBI computer. They are a team. But I think he took the note she wrote to me and did not tell her. I think that’s what she was looking for.’

‘Why would she look for it in Brown’s bedroom?’ Tucker wondered. ‘Is there a reason she might have had it in there?’

‘Certainly,’ I said. ‘She took her clothes off in there. Perhaps it was in a pocket. Play that part, Marino. When Gault is moving the dark clothing off the bed.’

He went back to that segment, and though we could not specifically see Gault remove the letter from a pocket, he did tamper with Carrie’s clothing. He certainly could have gotten her letter at that time. He could have placed it in Brown’s pocket later, in the back of the van or perhaps in the morgue.

‘So you’re really thinking she’s the one who’s been sending the notes to you?’ Marino asked skeptically.

‘I think it’s probable.’

‘But why?’ Tucker was confounded. ‘Why would she do this to you, Dr. Scarpetta? Do you know her?’

‘I do not,’ I said. ‘I’ve only met her, but our last encounter was quite confrontational. And the notes don’t seem like something Gault would do. They never have.’

‘She would like to destroy you,’ Wesley calmly said. ‘She would like to destroy both Lucy and you.’

‘Why?’ Janet asked.

‘Because Carrie Grethen is a psychopath,’ Wesley said. ‘She and Gault are twins. It’s interesting that they are now dressing alike. They look alike.’

‘I don’t understand what he did with the letter,’ Tucker said. ‘Why not just ask Carrie for it instead of taking it without telling her?’

‘You’re asking me to tell you how Gault’s mind works,’ Wesley said.

‘Indeed I am.’

‘I don’t know why.’

‘But it must mean something.’

‘It does,’ Wesley said.

‘What?’ Tucker asked.

‘It means she thinks she has a relationship with him. She thinks she can trust him, and she’s wrong. It means he will eventually kill her, if he can,’ Wesley said as Marino turned on lights.

Everybody squinted. I looked at Lucy, who had nothing to say, and sensed her anguish in one small way. She had put her glasses on when she did not need them to see unless she was sitting at a computer.

‘Obviously, they’re working tag team,’ Marino said.

Janet spoke again. ‘Who’s in charge?’