I really wish I could remember the name of it, but it’s about a lawyer who effectively puts the devil on trial, except it’s really messed up in parts. There’s this entire sequence involving a girl, a young child, who over time seduces the main character who describes in great detail the experience of screwing this child, only for it to be revealed that the girl was the devil/a demon of some sort whose sole purpose is to corrupt the main character. The majority of the book was great, but that particular sequence was well into distasteful and disturbing.

I think it was called Son of the Endless Night, but I’m not certain if that’s correct.