Here is hwat I have so far:
In a world similar to our Earth of the 1930's in look and feel but many aspect is different. The allies, Axis and many others have been delving into the occlt from the start of the war to get the upper hand. When the testing of many atomic bombs went off at the same (the start of the difference) a huge merging of our world and the spirit world was starting to take effect. This merging of Earth (the material world) and the Spiritworld is making most big cities and countries all over earth go into a flux allowing creatures flow into our plane becoming corperal in several different ways. Some of these creatures (no name yet) are the true reasons behind the many folklore of faerie and horror tales. They do not resemble completely what the tales describe them, since myths is exggreate too much based on truth. The "spirits" seem to be a mix of creatures from both the mythic and the horror.
With merging comes a price with these spirits are now apart of this plane, fully intergrated living among us, not hiding from within the shadows or undergound, most anyway. The merging also changed the this Earth, making the cities and the land become a morphic state. The lands and building have changes in look and feel, making them have xenomorphic style, think the hives in the Alien movies of teh Zerg from Starcraft.
This megring changed some people into monsters, chaninging them completely destroying their formers lives, giving them new purposes in this new Earth.The Allies, Axis and many others in war have now changed in name, power and goals. This has happen all over Earth morphing the plane into where the setting begins. This merging happen 2 - 4 years past.
This is what I have so far, changing alot of ideas I had. I wanted to have both horror and mythical creatues in the game but not do the typical D&D/Tolkien cosmology and look. You might think this is Cthulu which is not cause I have a have vision of what I am going for.
With all my posts in different threads have been about this game. Hope this helps alittle, like I said, still working on it.