I've had a moment of inspiration.
I was reading Beedo's Dreams in the Lich House post about Threat Analysis in a Weird Setting, where he discussed a campaign set in quasi-historic Reformation-era Europe and based on the diary of an inquisitor when a moment of inspiration has struck me. I have been thinking for some time about a post-Revolutionary city where conspiracies, both mundane and occult, abound, but now I had a framework for my campaign: the PCs would be agents of the City's equivalent of the Committee of Public Safety charged with investigating various threats to the new Republic.
Not only will this give the PCs a lot of freedom and a powerful patron, but also a reason to adventure: to investigate an root out conspiracies, secret societies and cults of all sorts, not to mention monsters.
I'll talk to Hani about this - she has a keen interest in revolutionary history, so this might appeal to her...