Werewolf Seattle Game
The shadow realm is the realm of the spirits, controled by no one and filled with spirits living out their lives based on the the type of spirit they are. Some spirits find this place difficult to live in and want to get to the other side where they can find free energy to survive away from the problems they had in the spirit realm.
Some areas of the spirit realm have corisponding places or areas on the materal plane, but do to the differences traveling a long distance over the materal realm in the shadow ream can take moments and short trips could take miles. Only experenced spirits and werewolves try and use this to their advantage.
The spirit realm influences the materal realm and vise versa, this is where werewolves come in, keeping the balance between the two, and keeping them in their proper place.