Awakened by a Demoness is book 10 in the Eternal Mates series and, unlike many of the others, this one can honestly be read standalone with nothing being missed. For fans of the series, this is almost an aside. They may hold a place in future books (Rey, the fifth commander of the Echelon, is at least acquaintances with the fourth commander who we have met before), but that is yet to be seen. If you're a fan of Mrs. Heaton's Her Angel series, this one will also appeal to you.
The book is written in third person omniscient from both character's point of view and features a demoness (extremely rare in this world) named Asteria and an angel she names Rey (angels don't have names). The two are sent on a mission (separately of course) to turn a half-breed angel/demon to their side. Nothing is ever cut and dry, however, and as seen in previous books, heaven and hell are playing a game that we can't quite decipher. Yet. The story is fairly fast paced and takes place in places we've been before in previous novels with a few new peeks.
Asteria is overall just kinda fun. Not sure there's a better way to put it. She's been dealt a pretty crappy lot in life, but she sure does make the best of it, and it's fun to read. Rey, on the other hand, is stiff and unyielding in all things, knowing only duty. As with all previous books, this is a fated mate situation, so you can bet she winds up showing him a different view. It's fun to watch them find their way to each other, but also heartrending to see them learn truths that tear their worlds up along the way. The end was certainly a surprise and may portend important facts for the future.
If you like your romance with a lot of sass, some life lessons and revelations, wings, a healthy dose of steam, and a love to cross any boundary, I'd say this is a good one for you.