Other nominees in the same category are London Falling by Paul Cornell (Tor), Cold Steel by Kate Elliott (Orbit), The City by Stella Gemmell (Ace), and Without a Summer, by Mary Robinette Kowal (Tor). All of these books received 4 1/2-star reviews from RT Book Reviews.
You can find the entire list of nominees in all categories here.
Did I mention I’m thrilled? Also gratified? And excited?