Iron Druid jumped the shark a few books before he put the series out of our misery, so I hadn't paid much attention. I saw the second book of this new series sitting on my library's New Book shelves, so backtracked to this. Enjoyable.

Set in the same world, towards the end of that series, centered on Al MacBharrais, a sigil agent in Scotland. They're responsible for enforcing contracts with the other planes, using sigils provided by the Chinese an Fae pantheon. He's also cursed so that folks hate him after hearing his voice too often. This book centers around a Fae trafficking ring, exposed by an escaped hobgoblin. It's a nice, easy read even with plot holes such as Buck not being able to port knives because of iron but then repeatedly porting guns.