Suffering from 1st book syndrome currently. Mercy is a little weak in terms of strong female protagonists. If you prefer female heroines such as Kate Daniels, Cat from Nighthuntress, Merit from Chicagoland Vampires or Mac from KMM's fever series, this might be a touch light for you. It's hard for me to sink my teeth into a character that I view as weak. Maybe it'll get better. It may have been the cover picture that threw me. I was expecting a kick a** heroine and instead got more of a shuffle and slide heroine, if you know what I mean. 
 I hear the series improves in subsequent books. 
 Finished Silver Borne last week. Still have River Marked to read. Overall, enjoyable but can't say that Mercy will be one of my most memorable female protagonists.