Babel-17.

A confusing mix when it comes to tone, this story reads mostly as a pulpy space opera, except for those moments where it launches into complicated discussions of linguistics and grammar.

Rydra Wong is a poet with such a great knack for learning languages that it borders on telepathy (body language is a language too, after all), and she uses her talent to decode the messages of the Invaders who, as the name suggests, are at war with her society.

I'm not a linguist, but I believe that the scientific theories on which the premise of this book is based have been debunked , which didn't help my suspension of disbelief. Personally, I was much more interested in another idea Delany introduced: discorporate people. Basically, in the future we prove that ghosts do exist, we just haven't yet developed the technology needed to perceive them. Without technological intervention we simply forget our interactions with the discorporate as soon as they happen, leaving us with nothing but the lingering feeling of being haunted. His vision of a future in which the dead are integrated into society is fascinating, and I would have preferred a book that focused on that idea.