So, up first...
Soulless is about Alexia Tarabotti, who biggest problem is not that she doesn't have a soul; the facts that she is half-Italian and "on the shelf" at age 25 are often much more vexing in her daily life. Alexia lives in a world where werewolves, vampires, and ghosts not only exist, but are more or less integrated into society (sitting in Parliament, running the military, at least in England). It's steampunk meets Victorian romance meets mystery, with lots of tea and gay vampires. If you loved Amelia Peabody, but grow tired of the same gags over and over (I hit a wall at The Last Camel Died at Noon), or if you love Vicky Bliss, come meet Alexia.
I'm explaining this badly. It's very good. The author's FAQ does a much better job of explaining. I'm already reading the second one, Changeless.