More I read the series the more I grow attached to the characters and the more I grow attached the story. I don't think I can put this series aside if I wanted to. I'm hopelessly addicted.
A really good read (listen?) for the Desden series.
Do yourself a favor and start at the beginning of the series. This is jumping in at the deep end. You'll enjoy it more if you read them all in order.
The series continues to improve which seems uncommon in these long series. The characters are more developed, the story more intriguing, and the tension growing all while having each book stand on its own. You want more but you don't leave the book frustrated with nothing completed like Game of Thorns does.