So much for that idea
As with most of my ideas, it was shiny while it was new, but it didn't hold my interest.
My next abandoned idea is a setting that is 50% cinematic Sherlock Holmes, 25% Charles de Lint, with the rest varying dashes of Steampunk, Harry Potter, Dark Materials, Van Helsing, Sleepy Hollow, Dresden Files and various folk/fairy tales from the British Isles.
The basic premise would be a an English secret society accidentally broke the Milesian Accords trying to influence the Revolutionary War. As a result magic and things unseen began leaking back into the world.
This of course means I would get to play with history. Or I will until I get bored.