Bruce Baugh has started a thread on RPGnet musing about possibilities for this.
http://forum.rpg.net/showthread.php?t=388151
Might be worth Cold City/Hot War afficionados chipping in with tips.
Cold City/Wraith crossover
Submitted by Tim Gray on Sat, 05/04/2008 - 18:04.
Cheers!
Submitted by Malcolm Craig on Mon, 07/04/2008 - 22:41.
Thanks for the heads up on this Tim.
It's interesting stuff. Although, I'm pretty unfamiliar with Wraith as a game, apart from the excellent Charnel Houses of Europe sourcebook.
Cheers
Malcolm
Contested Ground Studios