Devin has a demon blade. This blade is like a sentient being. It hungers for chaos, so Devin uses it in a productive way and helps people in trouble. Natalie is in the wrong place at the wrong time. Or is she? Devin uses it to dispatch her would-be assailants.
I liked that Natalie's background was questionable. I liked that she was doing better. She's got some attitude (but not enough that she was a bitch/unlikable). I did think she should have caught on sooner then she did. Both she and Devin work together nicely. I also liked the end.