I love Rachel Caine's Weather Warden series - well, at least the first four or five books which I have read - but hadn't read any of her more recent offerings. When I picked up 'Unknown' I assumed it was a different series than the Weather Wardens, which indeed it is, but it has many links to that previous series and mentions many of the same characters.
I haven't read the first in the Outcast Season but that didn't appear to matter too much; I think I'd have found this book much more confusing if I didn't know of the basic structure of the Weather Warden series and some of the people in that. This book was rather darker and less character-driven than the others, focusing on Cassiel, a Djinn who is now something approaching a human, and who, with Earth Warden Luis Rocha, is trying to stop another ancient Djinn, Pearl, from destroying humanity (what else!)
This book is very fast-paced, like the Weather Warden series, with our heroine dashing from problem to disaster. Lots of people are caught up in the crossfire and she leaves a trail of dead bodies, most of whom aren't her fault. The book hints at a romance but this wasn't particularly developed. It was an enjoyable read but somehow I felt the action was taking over too much and I didn't really connect with any of the characters. Cassiel is clearly developing but I wasn't entirely sure how it would play out, and I also felt that Pearl was a bit too nebulous an enemy, and not knowing the extent of her powers made it hard to gauge the real level of jeopardy for Cass and humanity.
Although I enjoyed the book I was a bit disappointed by the ending which left most of the story hanging. I will probably want to read the next in the series but I did find this book a bit too unfinished for full enjoyment.
Originally published for Curled Up With A Good Book © Helen Hancox 2010