Find out who cut the whore

Find out who cut the whore is a quest in Fallout 2.

Detailed walkthrough
This is the third task you get from Earl Marion. You start by going to the Malamute Saloon to question Lou the bartender, and she shows you a Morningstar mine scrip. When you go to the Morningstar Mine and ask around, Obidiah Hakeswill will confess right away. From there you can either kill him and get $500 from Marion, minus quest XP, while letting him go gives no XP nor money from the sheriff. The best option is to take him into custody peacefully, which gets you 1250 XP and $500.

Note: It's impossible to start dialogue with the bartender if Lenny, Marcus, or K-9 accompany you.

Behind the scenes
In the Sharpe book series by Bernard Cornwell, Obidiah Hakeswill is also the name of one of Richard Sharpe's Archenemies who has a very unhealthy relationship with his mother and a penchant for violence against women.

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