After Sophie went home, I walked the neighborhood.
It was late afternoon, and Cedar Falls looked the way it always looked on a Saturday β kids on bikes, someone mowing, the smell of cut grass and charcoal. I walked past fourteen houses without knowing which ones Grace meant, and that was the point that kept turning in my head: I could not tell. If there were hidden devices on fourteen roofs in this town, the town looked exactly the same as it had yesterday.
I stopped at the corner and called Delgado.
"She told Sophie there are fourteen signals," I said. "Fourteen houses. Across town."
"I know," Delgado said. "It's in the statement. She logged them over eight weeks. She has addresses."
"Do you believe her?"
There was a pause. In the background I could hear the station β a phone ringing, someone laughing too loud.
"Mr. Mercer," Delgado said, "an hour ago I believed your neighbor was a vandal with a grudge. Now I have eight weeks of signal logs from a woman with thirty-four years of telecom experience, screenshots of a livestream that doesn't exist anymore, and a SunHarvest technician who filtered her emails and intercepted her mail. I don't know what I believe yet. But I am no longer calling it a grudge."
"What's the next step?"
"A cybercrimes investigator from the county is coming out. Name's Dana Cole. She has an open file on SunHarvest already β three homes in the next county reported suspicious devices inside their installations. Nothing ever stayed in place long enough to examine." Another pause. "Your neighbor may have just handed us the one that stayed."
I walked home slowly. The sun was dropping, and my roof was a long red smear against the sky. From the street it looked vandalized, which was what Grace had wanted. She had wanted it visible.
Mia was waiting on the porch. "Sophie texted. She says her grandma's being released. No charges yet. They're calling it an ongoing investigation."
"Good."
"Dad." Mia hugged her knees. "If there's really a camera under panel six β pointing at Sophie's window β then Mrs. Thornton wasn't hurting us. She was protecting Sophie. Right?"
"That's what she says."
"And the fourteen houses?"
"I don't know yet."
Mia was quiet for a while. Then she said, "She could have told us. She could have told you in person instead of climbing the roof."
"She tried," I said. "The notes. The emails. The door."
"Someone stopped her."
"Someone stopped her," I agreed.
That evening, after Mia went to bed, I sat in the dark kitchen and thought about what Grace had actually done. She had not attacked my house. She had attacked my roof's ability to make power β and she had done it four times, each time accepting the risk that I would call the police, that the neighbors would see, that I would hate her. She had done it knowing exactly what it would cost her.
I thought about the tar. The cut cables. The cloudy film. The red paint. Four acts of destruction, and every one of them aimed not at me but at something using my roof β something that went quiet every time the panels went dark.
She had told the truth on the roof that morning, in her own order. She had said she did the other three times too. She had said she was stopping it from turning back on. She had said not to reset the inverter. And when I asked who would know she had failed, she had looked at Sophie's window and said her granddaughter was still inside.
I had heard all of it and understood none of it, because I had been listening like a man whose property was being destroyed. I had not been listening like a man whose neighbor was trying to tell him something.
At eleven that night, my phone buzzed. A text from an unknown number.
It was Sophie. Just three words:
"Thank you, Daniel."
I stared at the screen for a long time. Then I typed back: "Your grandma's coming home tomorrow. We'll figure out the rest."
I did not sleep that night. I kept thinking about fourteen roofs across Cedar Falls, all of them breathing in the afternoons between three and five, all of them going quiet whenever my panels went dark. My roof was the center of it β the central relay, Grace had said. When my array went offline, the entire network stopped transmitting.
She had not been trying to punish me. She had been cutting power to every hidden device in the neighborhood, one roof at a time, with whatever she had in her garage.
A can of tar. A pair of cutters. A spray bottle. A can of red paint.
And a ladder.