I keep coming back to the same question. Not what happened to Maren Calloway — I don't know if anyone will ever answer that cleanly. But why her? Why did a woman with no institutional backing, no funding, no academic credentials beyond a state college degree, build the most comprehensive catalog of spatial anomalies anyone has ever seen? And why did nobody notice until she was gone?

I've spent the last week asking around Linden Hollow. Not formally — I'm not that kind of journalist anymore. I just talk to people. At Harmon's, at the library, at the gas station where Tommy Banks draws his pictures. And what I'm finding is that everyone remembers Maren, but nobody really knew her. She was the woman who worked at the library. She was the woman who walked Calloway Creek at dawn. She was the woman with the maps on her walls and the radio equipment in her spare bedroom and the correspondents all over the world who sent her letters about things that shouldn't be possible.

Del Rojas has been helpful, in her way. She was Maren's student — one of the night classes Maren taught at the high school, back in the late '70s. "General Science," officially. From what Del describes, it was more like a seminar in paying attention. Maren taught them to listen to places. To sit still long enough that the background noise became the foreground. Del says most students dropped out after two weeks. The ones who stayed changed.

I asked Del what Maren was like. She thought about it longer than I expected.

"Careful," she said. "She was the most careful person I've ever met. Not cautious — careful. Like someone carrying something that would break if she moved too fast."

That stuck with me. I've read maybe forty pages of Maren's journal now, and "careful" is exactly the word. Her handwriting is precise without being rigid. Her observations are thorough without being clinical. She documents what she finds the way a naturalist documents a species — with respect, with patience, and with the understanding that she's looking at something that existed long before her and will exist long after.

The March 14, 1972 entry is the one I keep going back to. Maren documents a sound at Calloway Creek — "a sustained tone, approximately 127 Hz, felt more than heard, present between 3:00 and 3:40 AM, absent by sunrise." She rates it a 7 on her confidence scale. She notes that her cat, Walter, sat facing the creek for the entire duration without moving.

Here's what stopped me: three listeners from the podcast, in three different countries, have independently reported the same frequency — 127 Hz — at locations that have nothing in common except that they're all near running water. One in Scotland. One in Hokkaido. One in Northern California. They didn't know about Maren's journal. They didn't know about each other.

I don't know what to do with that yet. But I know it means something.

Nadine at Harmon's remembers Maren's coffee order — black, no sugar, always in her own thermos because she said the diner's mugs "held onto things." I asked Nadine what she meant by that. Nadine shrugged. "Maren said a lot of things like that. After a while you just nodded."

I'm starting to understand why nobody noticed when Maren disappeared. It wasn't that they didn't care. It was that Maren had already been living in a world most people couldn't see. When she stopped showing up, it was like a frequency going silent. You'd only miss it if you'd been tuned in.

I wasn't tuned in. Not then. I'm trying to be now.

— Vera