Even if you read and end up disliking this book you have to appreciate Rachel Caine's writing style -that being worth a star or two on it's own. 
 The first part of this story does drag a bit while we get to know the characters, but that happens in every first book in a new series or even spin off series as with this book. The character of Cassiel reminds me of Amelie in Morgan vampires, cold and unfeeling and begins become more human the longer she stays in the form and the longer she's around them. Some who read this book will dislike Cassiels character as she is about as cuddly as a terminator. She is growing though. Caine always presents a stimulating read. 
 Another plus, if you are a hater of five second romances, not happening here. That is one of the biggest gaffes in urban/paranormal fantasy, they cannot seem to get away from love at first sight romances. Quite appreciation and future interest adds more mystery to the book and will keep us coming back till we get it. Author embraces the story all heart rather than woo you into submission with unsaid, and very loudly thought, I love yous until the reader is ready to scream.