The Calling by Kelley Armstrong

Maya has figured out what she is, but faces the challenge of her life when she and the other teenagers' helicopter crashes.  They are on the run from the Nasts and need to find their way back to civilization so they can find their parents and find help.

Another riveting story by Kelley Armstrong.  I'm really loving how she's tying her two series together.  I can't wait to read the third and last book in this trilogy!