Knock on the door with your helmet unequipped and impersonate Monobrow Sam.
Prepare for a fight with a level 30 thief and level 30 furtive stranger and enter the Thieves' Den.
If you retreat from the fight area or die, taking a fear potion before returning will stop the thief from attacking you upon re-entering the area.
If you kill the thief and die after, the thief will stay dead, allowing you to fight the furtive stranger.
The furtive stranger can be difficult at low levels, try using a range weapon to get a few hits in before he reaches you, then be sure to have potions to heal during the fight.
Kiting the thief and furtive stranger around the central box in the room can help to delay their attacks, allowing you to take more health potions during a fight and/or regen more health over time.
This article on a quest has an associated dialogue page. Click here for a transcript of possible conversations and other messaging encountered throughout the quest.
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