The City of Solstice is a low-magic fantasy campaign set in an ancient city, now ruled by the forces of evil. The PCs in the campaign are members of the Vigilant, the city watch. Imagine if “The Untouchables” were set in a fantasy city, rather than 1920’s Chicago. In addition to the Star Society, there are gangs, petty crime, and corrupt guards to deal with, along with every sort of crime you can imagine: murder, prostitution, drugs, and theft.
There's a free (PWYW) quickstart guide on DTRPG which is interesting. On the flip side, it seems almost radically different from most fantasy settings and might be hard to incorporate into an existing game. I like stuff I can drop into my world. And getting PCs to play cops, even fantasy cops, might be a tough sale.