More thoughts on the love story ...
Looking at my tendencies in writing, I've often created stories where there's a tension between the character's role in life - not just their occupation, but the thing which defines and drives them - and a romantic interest. I don't, personally, believe that trading what you love for who you love is a fair or healthy exchange, and I think that's reflected a lot in my fiction.
This was, in fact, a huge issue with Who Wants To Be A Hero? ... where this potential conflict arises and, not only couldn't I see my way clear to writing my female lead choosing the love interest over (removed for spoilers), I couldn't see him allowing her to do so. It took much of the novel (knowing it was coming and planning ahead) to work out how I was going to handle it. It turned out to be a solution that was eminently appropriate to the format.
It's something that would be central to the rewrite-project-of-doom I had pondered, as arguably, most of the plot arc is catalyzed by a romance story - the villain's.
By the way, Unnatural Causes is still tabled - I want to come back to it when I have room to devote my full attention.