What Carmody has been doing brilliantly since Obernetwyn is world building, creating a mystery around it that makes you want to keep reading to learn more. In the decades since, she's also honed how to write teenagers naturally and in ways that model relationship skills and social responsibility. Which is a way of saying that Comes the Night is a highly enjoyable read, hard book to put down, and peppered with characters you desperately want to be okay.
I often - okay maybe always - feel with her books that the third act plotting isn't at the level that the rest has me hoping for. It is not bad, it is just that it isn't the stupendous payoff that all that great teasing in the first half has me set up for.
But if for nothing else, it is so nice to have a novel set in Canberra - a futuristic Canberra no less - which manages to capture the vibe of the city in a very dystopian way. And it is nice to have a dystopian novel that acknowledges the likely trade offs ahead of humanity. 
As a lucid dreamer - one who developed the capability as a way to manage nightmares - I also both appreciated the acknowledgement of lucid dreaming and then eye rolled as it all turned into something else entirely.