City of Eternal Night (Crescent City #2) by Kristen Painter
In this book, Harlow learns why her evil father wants his house. He will do anything to get it and when he kidnaps a teenage fae girl, it is up to Augustine and Harlow to save her. There is action from the witch sector of the city as well and Augustine suspects that all the problems are connected. Action, romance and fantasy fill this second book in the trilogy.