Most quests in Oblivion Remastered require you to stumble upon them one way or another. You have to murder someone to get access to the Dark Brotherhood, for instance, and you need to join the Thieves Guild or Mages Guild if you want access to their questlines. In Skingrad, one of the provinces' major cities, you'll run across an especially sinister quest full of intrigue...
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How to complete the Paranoia quest in Oblivion
Source: PC Gamer (opens in a new tab)