Thanks to the publisher for this ARC! "This Girl's a Killer" throws you straight into the action and mind of our protagonist, Cordelia Black - self made powerful HBIC with a razor wit and a hidden tragic past. The concept for this book, a female serial killer taking out bad men that the system won't, is always a fun one, but what made this one extra fun was that she is a medical sales rep. That tidbit added some extra tension throughout the book and helped add believability to her cause. My one complaint would be that there is a lot of telling from inside Cordelia's head rather than showing, and I did find some points in the book where I was skimming because it was a repetition of earlier plot/character information. Overall, if you like stories with female rage, karma, found family, and thrills, you'll enjoy this book.