“That’s the right way to do it,” Lucy said. “But she didn’t bother. She continued to revise and save the same file, overlaying one on top of another. Stupid. But half the world does it. Fortunately, every time she made a change and saved that same file, it got a new date stamp. Even though you can’t see it when you look at her list of documents, it’s in here, scattered all the hell over the place. The computer will find the dates, and sort by them, and do a pattern analysis. For example, how many times in one day did she or someone revise and save the same file? In this instance, the master’s thesis file. What days of the week did this person work on it? What time of day or night?”

Berger made notes and said, “Might give us an idea of where she was and when. Her habits. Which might possibly lead to who she was with. If, for example, she spent most of the time in her apartment working, except on the Saturday nights she saw Oscar. Or did she go to other places to do her writing? Perhaps even another person’s residence. Did she have some other person in her life we don’t know about?”

“I can get you a timeline right up to the last keystroke she ever made,” Lucy said. “But not where she worked. E-mail can be traced to an IP address, saying, for example, she did e-mail off-site, such as in an Internet cafe. But there’s nothing to trace when we’re talking about her word-processing files. We can’t say for a fact that she always worked on her thesis at home. Maybe she used a library somewhere. Or Oscar might know if she always worked in her apartment. Assuming anything he says is true. For all we know, he’s the one writing this thesis. I’ll continue to remind you of that.”

“The cops didn’t find research materials in Terri’s apartment,” Berger said.

“A lot of people have electronic files these days. They don’t have paper. Some people never print anything out unless it’s absolutely necessary. I’m one of them. I’m not a fan of paper trails.”

“Kay will certainly know how much of what Terri or someone was collecting and writing is accurate,” Berger said. “Can we completely re-create every draft?”

“I wouldn’t put it quite like that. Better to say I can recover what’s here. Now the computer’s sorting by bibliography. Every time Terri made a new entry or revised or altered anything, a new version of the same file was created. That’s why you see so many copies of what appears to be the same document. Well, you’re not seeing it. I assumed you’re not looking. How are you feeling?”

Lucy looked over at her, looked right at her.