The addition of romance in my books or mystery to a historical romance is the sauce, not the goose.
— Deanna Raybourn
In creating a new character, it's sometimes difficult to find a touchstone, a North Star that will always point you in the direction that character will travel.
It sounds ghoulish, but it would have been fascinating to be in Paris in 1789 and watch the revolution begin. I can't even imagine what the energy must have been like that year with all of that change crackling in the air.
If you lift the romantic element out of my plots, you still have fully formed mysteries. In the same fashion, if you pull the mystery out of a historical romance, you are left with a perfectly satisfying story.
Among my favorite half-dozen topics is the field of Victorian female explorers, the intrepid women who packed up their parasols and petticoats and roamed the world in search of adventure. Some were scientists, some artists, some unabashed curiosity-seekers who simply went out to see what they could see.
To know how a character will behave in any given situation is a necessity and a gift.
One of the joys of writing historical fiction is the chance to read as much as you like on a pet subject - so much that you could easily bore your friends senseless on the topic.