I read all three books in under two weeks while at home with strep-throat.
I was very quickly intrigued by the main character, and liked her immediately.
From there, I just could not read the books fast enough, I needed to know what happened next.
I love that the female protagonist is essentially the age of a high-school senior, but is brilliant, strong-willed and lethal. She's no passive debutante. Any person who has had to struggle in their life, especially as a child or young adult, can appreciate the way that forms you as a person. How it can make you a little hard.
Apparently these books are classified as "young adult" but I got a real kick out of them, and I'm not a young adult. I'm merely "adult." I mean, the stories are quite violent. More so than many adult science fiction novels I've read.
Unapologetic. Action heavy. Great characters. An absolute riot.