Necessary Evil tells the story of a low-level demon at Hell LLP who is mysteriously promoted to CEO. Suddenly he must navigate a very different world of office politics, deal with new, powerful adversaries, and figure out why he was chosen.
When Azmodeus gets promoted to CEO of Hell LLP, he struggles with the responsibilities of becoming Satan, new adversaries and his own internal demons.
As a low level, data-entry demon working at Hell LLP, Azmodeus’ existence is rather miserable. When he receives a call to the top office, Az’ life will change forever, and not necessarily for the better.
Nyx informs Azmodeus that he must select a Devil’s Advocate as a member of his personal staff. Az experiences the hellish side of interviewing, and finds out what’s at stake.
After Azmodeus makes an unconventional choice for his Advocate, Hades confronts him. Nyx helps Az handle Hades and lets Az in on one of the secrets of Hell LLP.
While pouring over the corporation's finances, Azmodeus finds an anomaly in Soul Contracts. He questions Mephistopheles, who takes Az on a soul collection, and Az learns more about the odds stacked against him.
Azmodeus and Persephone get trapped in an elevator. While waiting for rescue, Persephone gets Az to open up and offers him some important advice.
Mammon, head of security, has been sent by Hades to 'take care of' Azmodeus. With no friends, skills, or hope for escape, Az must face Mammon alone.