Interesting method of determining if someone is home.

In your second-to-last paragraph, I think you intend every window left, but the way you have it worded is somewhat ambiguous. Other than that, I’m really enjoying your writing style. It has a very nice rhythm and flow to it, with just enough flowery prose to make the words—not just the story—an interesting read.

You’re right that it’s a bit ambiguous, but I didn’t want to use the word “window” again right before the end: I wanted people to remember it from the first line and the title. If you have a suggestion, I’m very happy to entertain it.

How about “he’d systematically walked the streets, found every last pane.” Would that work? It kind of helps to reinforce the fact that he was looking for windows, he found them all, and it gets around using the word “window.”
I think the problem with the way it is now, is that the two paragraphs prior, you talk about him looking for people, but in this sentence you’re talking about him looking for windows. Does that make sense?