Left on Harry's doorstep sometime in the early hours of the morning is a bulging folder filled with charts and typed pages. Leisha's Divergent Timelines project, in which she's charted some of the alternate histories of the worlds people have arrived from, and also examined geographical concentration. Most are from Earth. An improbably high number are from Chicago. That sort of thing. It's impressive work, from an eleven-year-old. Attached is a handwritten message.
ATTN: HARRY DRESDEN
I finished it! I wanted to take it to you straight away but I guess you're sleeping and apparently it's rude to wake people up. Anyway, this is what I can tell about us walk-ins or refugees or whatever the right name for us is. It's all there, excepting very new arrivals and the people who didn't want to talk to me about their home. Or at all. Privacy's important and I respect that. I hope it helps a little. Don't give it to anyone else.
I want to help more, if you've got anything else I can work on.