Mary Murphy works in Hell. It's usually a pretty good place to work, with high salaries, great benefits, and immortality as a job perk. When Satan decides to take a vacation, all that changes. There is a lot of jealousy and resentment from employees who feel the promotion should have been theirs, but no one dares to go against Satan's choice.

As the week rolls forward, Mary discovers that she has a saboteur in Hell. The problems start with practical jokes, but quickly accelerate to vandalism and attempted murder. The pressure is on as Mary tries to find and capture the guilty party. Will she be able to catch the culprit and put Hell back to right before Satan returns?