TW: SA, Death, Porn, Violence

I found this random book in a waiting room 20 years ago. It was a really intense book and I never finished it before losing the book. I’ve been trying to track it back down because it was such a random book but no one seems to know what I’m talking about when I describe it. It was a British book.

The beginning of the book is about a young woman (high school or college) riding a train at night when she is gang ***ed by a bunch of rich guys who were about the same age as her. The rest of the book is about her friend trying to avenge her friend by tracking down the guys to kill them. The way she kills them is twisted. She makes it look like she is making snuff porn while really killing them. I remember a scene where she is complaining about how she needs to make the deaths look really fake for the movie while actually killing them and how much harder it was to make it look believably fake.

Does anyone know this book’s title?