In 1997 every ghost in the world raised up and killed two thirds of the population in just one week. World leaders were powerless, prayers went unanswered, resulting in every government and religion collapsing. Eventually a group were able to imprison most of the ghosts in a huge underground city - they called their organization The Church Of Real Truth.
The Church Of Real Truth is today the world's only power; there is no other government, no other faith, just The Church. They are in the process of hunting the ghosts that remain uncaptured and compensating the unlucky people being haunted. To find the ghosts the Church educates and trains witches [known as debunkers] to find and capture the ghosts, and find the fraudsters faking a haunting to try and defraud money out of the Church.
Cesaria 'Chess' Putnam is one of these debunkers. In fact her recent work on previous cases has put her in high esteem of her superiors. But what they don't know is that she has been leading a double life of sorts. She has a drug addiction and her drug dealer [Bump] views her as one of his lackeys that shall do his bidding for him whenever he so chooses.
It's a combination of her job and her 'problem' that lands her in trouble; Her drug dealer [bump] jacks up the interest on her debt, knowing that there's no way she can pay it off. But hey, it just happens that he has a problem she can help him with. A ghost problem. If she helps him he'll forget all about her debt.
So all Chess has to do is check out a abandened airport Bump plans to use for smuggling, to see if it's really haunted, or if someone is faking it to sabotage Bump's planned business expansion.
Sounds straightforward? Fasten your seatbelt; we're just getting started...