Hexed is the second novel in the Iron Druid Chronicles series. In addition to some nasties that escaped him in the first book in this series, Atticus has to worry about witches he's clashed with before. A long time before.
Atticus usually doesn't want anything to do with witches. However, the local coven are the lesser of two evils so he's going to have to make nice. He's going to need the local witches to help him take care of some out-of-town witches that have a grudge to settle with him. If he just didn't have to deal with a fallen angel, some nasty bacchanals, and a couple of pesky goddesses first. Very highly recommended.