The book was about a guy who stumbles onto a bunker of lizard people aliens after strange things were happening. I don't really remember much else.
I read the book about 15 years ago. I believe it was fairly new at the time. All I remember is that it was following a boy who was investigating strange things happening and stumbled on to a bunker underground. I believe the alien lizard people in the bunker were doing experiments on humans and animals.
I think he found a cow that was mutilated. There were lots of weird lights and sounds in the area. It was a short story.