Bride Stripped Bare was the one that made her, but I think Shiver is probably my favourite. She alternates between this breathtaking description of everything and really, really honest, gritty depictions of sex.

I've read one of hers that gave me the right irrits - can't remember the name of it. Regardless, I always buy the latest by Nikki because of her potential to shock me out of a reading fugue.