For a while I was tempted to give up listening to it and get the text version because it was so fascinating, but I was tired and kept falling asleep at night. In the end I'm glad I stuck with it - Language is unique enough to add another dimension when spoken aloud.
Avice is a woman who has grown up on a strange backwater colony that has designed itself and some of its denizens to communicate with the locals in a language like no other. She was once drafted as a simile, but made it out as a space-farer. She returns partly for nostalgia and partly to please an academic husband who is fascinated by her past.
My immersion in this world was tinged with dread because I know that Mieville is hard on his characters, and he is here too. A new kind of Ambassador has disembarked with Avice to throw a wrenching spanner into the lives off all beings on the planet.