Stairway to Heaven

You all hear of it the mythical stair way to heaven. Well, those who see of their loved ones know the false hood to the 'stair way' prospect. There is no stairwell at all, but rather a long bridge. A mortal can only stay on the other side of the bridge for 3 days before they either most return to the world of the living, or they become a spirit themselves. the exception to this rule, are the spirit's living slaves...