From the Introduction:
From the Thirteen Heavens of the Aztecs to the High Hall of Hel, the realms of the afterlife never want for tenants. Someone has to take departed souls to their final resting places and that someone is you. Your job has many names: psychopomp, guide, ferryman, ghost.
There are those who seek to take those souls for themselves and they grow bolder and more clever with each passing year. These Agents of Oblivion literally make the world a worse place. They deny the living their closure, they keep the dead from their rightful rewards or punishments, and they unbalance the metaphysical scales that keep the universe running.