I heard this on tape as an audiobook when I was much younger. I have a feeling it had some fantasy elements, it was definitely a horror-ish story at the end, and not a short story either.
A small group of children, maybe 10-15 years of age, find an abandoned house and set it up as their den, using the fridge and putting sofas inside, etc. A teacher is hunting them down for some reason, and at the end he captures one of them as a "fanfare" (that's all I remember it saying) was playing on loop on a tape machine. They find out the tape machine was in the middle of an empty room upstairs and the man that was looking for them is standing outside the window. They throw something at him (maybe an apple) and knock him out. The next time they see him, he has a black eye.
It was a reasonably lighthearted story up until the disturbing ending.
EDIT: I was listening to it about a decade ago, so nothing newer than that. It was several hours long, maybe eight.
Any ideas at all would be appreciated, Google turns up nothing.