This is the story about a young girl who discovers that she is a witch, and that she has a grandmother she didn't know about that is also a witch. During the trilogy we get to know her story and how she discovers her powers.She discovers there are people called witch-hunters that will try to kill her if they discover what she is.
I found the series a good read, although I feel it was definitely meant for a younger audience (I'm early 30's). I still found the story interesting though, and I think it is really well written.
Definitely worth reading if you like the genre and don't mind books written for a younger audience (or if you are a young adult obviously ;) )