Bob is a substitute teacher who has a rather difficult side-job. You see, he has to collect the souls of the dead. What he has: Powers that don't help him evade police. He's ever living, but not immortal. His boss is his best friend. What's wrong: The police are on to him. The most powerful entity in the world wants him dead. His boss doesn't like some of his more recent choices. Welcome to the world of those who watch over the dead.