October Daye was still quite young when she had to make the choice and in crying out for her fae mother left her human father behind forever. Now a part of the fae world, where changelings are very distinctly second class citizens, October has to make her own way. She tries to hide in the human world at first but is forced deeper into fae when an important countess is murdered. The dead countess binds October to investigate, forcing her to resume her position in Faerie.
Seanan McGuire, writing as Mira Grant, has also started a zombie urban fantasy series which isn't to my tastes but got to the final ballot for the 2011 Hugo Award for Best Novel. That's actually pretty impressive for someone that's only been published for 2 years. The first book in the Newsflesh series is Feed. I'm also really looking forward to the first book in her new series Discount Armageddon: An Incryptid Novel.