The Forsworn Conspiracy is a quest discovered in Markarth. The quest is not necessarily easy at low levels though, especially if you desire to get the most out of the quest (both the Armor of the Old. The Forsworn Conspiracy / No One Escapes Cidhna Mine: These two connected quests should be done early in the Silver-Blood Spy's career as it represents the former Forsworn becoming the Silver-Blood Spy. I then went through the entire quest, killing Madanach in the process, stealing his key, and simply sneaking through the exit.
When I did, I yielded to the guards and told them to take me to jail. I initiated the Forsworn Conspiracy quest and finished it.