This is an excellent thread!
On one hand you've got Dresden ... no one knows about this stuff.
On the other hand you've got Fringe or X-Files ... the government knows and is covering it up.
Throw in a pinch of Delta Green and you've got a supercampaign!
Brilliant!
I am now picturing the inevitable wise-crack deathmatch between Harry and Mulder/Scully.
"It can't be real!"
"It is. See? Look at the trash can. Look at it. Loooook at iiiit...BAM!" [trash can vaporized.]
"...I would love to see you try rationalizing
that, Scully. This is proof of-of everything!" [Twenty minute ramble about alien abductions and JFK.]
"...uh..."
"Imps did JFK. Sorry. Some guy with the Venators cover it up after the fact." [Cut to Cancer Man laughing madly with a flame thrower in the dark.]
"WHAT?"
"And anal probing? Fairy prank." [Cue Toot.] "Turns out there was this guy back in Utah who-"
"BUT WHAT ABOUT MY SISTER?!"
"...well...there're these things called Hobs..."
Five minutes later, they're all drinking at Mac's and Mulder is converting to new age pantheism while Scully has a nervous breakdown at her beer.
The End
...or is it?