Hired Help

Hired Help is an unmarked quest in Fallout 3.

Walkthrough
If you speak to Ahzrukhal in The Ninth Circle in the ghoul city of Underworld, he will tell you that he holds the employment contract of a ghoul named Charon (also located in The Ninth Circle in the corner). Charon is bound to work for whomever holds his contract. Ahzrukhal also tells you that he dislikes having to compete with the other beverage outlet in Underworld, Carol's Place. He proposes that if you were to murder Greta, who works there, he would be willing to give you the contract to Charon.

At this point you have two choices:
 * Agree to Ahzrukal's plan, and kill Greta
 * Purchase Charon's contract through dialog.

Killing Greta
The simplest method to complete this challenge is to just kill Greta by your preferred means and return to Underworld once the residents have ceased to be hostile. If you do not wish to turn the town hostile, there are several alternative options:
 * The best time to kill her is when she goes on her smoking break just outside of Underworld in the Museum of History lobby area. She appears here around 9:00 PM nightly. This is much more difficult if Broken Steel is present and Griffon is selling his aqua cura as the ghouls will likely notice you.
 * Use the Mr. Sandman perk to slit her throat while she is sleeping.
 * Mezz her and allow the residents to do the work. There is no karma loss and no one will become hostile to you, although this only works if it makes her aggressive instead of blowing up her head or other side effects.

However you accomplish the task, you should then return to Ahzrukhal to complete the quest and retreive Charon in your party

Purchasing the contract
The most straightforward and easy method to acquire Charon from Ahzrukhal is to pay him 2000 caps. The sum can be reduced to 1000 caps with a Barter skill of at least 50.

Whether you kill Greta or purchase the contract, Ahzrukhal will stick to his word and give you Charon's employment contract. After you tell Charon that you now have his contract, he will walk over to Ahzrukhal, who will think he's coming to say goodbye. Instead, Charon pulls out his shotgun and blows Ahzrukhal's head off, then shoots his dead body one more time.

Bugs

 * If you should kill Greta before talking to Ahzrukhal he will not acknowledge that deed and no dialog options will appear so you cannot acquire Charon.
 * Occasionally Charon will kill you if you are around him as he shoots Ahzrukhal.