Thank you all for your feedback! Especially Matthew, the ONLY PERSON to agree with me that “iron hinge” is evocative rather than dull.
Pete, *I* like your suggestion, but it’s pretty clear that “hinge” is not working for most people.
Given all your comments, I will definitely at least suggest The Winter Dragon as a title. Maybe my editor will agree with all of you.
So right now I guess I’m thinking of sending her this list on the “title page”, such as it is:
The Dark Turn of Winter (thanks, Allen, I like this variation on your suggestion)
The Wolf Duke (there’s the protagonist. One of them. And this is actually the secondary protagonist, not the primary.)
Wolf and Falcon (that refers to both protagonists)
The Winter Dragon (because I agree with all of you that this is a good title)
Thumbs up and thumbs down on the top three possibilities?