The Diamond Age by Neal Stephenson. Recently got around to finally reading it. I know Snow Crash is considered his best sci-fi novel (and it’s amazing, too), but I think I liked this one even better. Snow Crash is funny and weird and action packed, but its light-hearted tone diffuses the tension. The Diamond Age, by contrast, had a lot of hair-raising moments and characters I was really invested in.
I always thought Cryptonomicon would be the go-to stephenson recommendation for nerds, but I guess it reads very dated now.
I think it holds up very well, as a testament to the time it was written in. It was also quite prophetic. There was a lot that went over my head back then.