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I'd say it is about a missing girl, mysteriously coming back to the narrator.
The eeriness of it.
"She looked up at me, as if by chance. " It both makes it obvious that it wasn't by chance, and shows the girl's behaviour, which adds to the mysterious, almost frightening element of the mystery.
It seems to carry a tone of, for lack of better words, "This shouldn't be happening" a sense of wrongness is created so that you feel near uncomfortable, but are so hooked in that you can't tear your eyes away. The author did an excellent job of making you want to keep reading.
The urge to read more!