Lori Devoti, Unbound: I liked this a lot and wish it was longer, because I wanted more time for the relationship to develop, always a difficult line to walk in series length romances. Devoti uses Nordic mythology as a basis for her worldbuilding; the hero is a Hellhound, enslaved to an evil witch; her heroine a woman in a world essentially like our contemporary one, who doesn't yet know that she is a witch, as well. There are lots of little details about the Hellhounds that I liked a lot because they made them seem more real, particularly their trouble seeing colors; I'm interested in learning more about them. I'm particularly wondering if there are female hellhounds; there was one mention of what might have been one, but I wasn't quite sure.
The heroine is a twin, and has always been the timider of the pair; her arc has to do with her learning her own strength.
I'm definitely reading the others in this series.
One plot thread I thought was going somewhere, but didn't, was a dog attack on the heroine and her friend when they were children. The friend was killed. I immediately wondered if it was supposed to have been a hellhound attack, perhaps aimed at the heroine, but it didn't turn out that way, at least not in this book. Which is fine, but I spent too much mental energy speculating about it while reading.