Picked this book up from the library as it is a spin-off series of Annie Bellet's Twenty Sided Sorceress series, which I enjoyed quite a bit recently.  It follows Alek's hitman sister, Kira, who we see briefly in the series. 

This was fun. Kira is vicious, but an excellent character, and I enjoyed following her adventures and her character growth. I hope that we'll see more of this series in the future.