Go inside the Raven Rock Mine and find Crescius Caerellius arguing with his wife. Speak with him to begin the quest.
Your investigation will ultimately point directly toward the Severin family. Adril will give you the key to Severin Manor so you can break in and find hard evidence of their treason. Look in the master bedroom's safe or search the basement to find a note confirming their plot with the Morag Tong assassins. how do i buy a house in raven rock
Locate Adril Arano in Raven Rock. He will explain that there is a conspiracy to assassinate the leader of the city, Councilor Morvayn. Go inside the Raven Rock Mine and find
Bring the evidence back to Adril. He will dispatch you to Ashfallow Citadel to eliminate the traitors and their contracted assassins once and for all. Skyrim: How to Get a House in Raven Rock Adril will give you the key to Severin
This reopens the mine, saves the town's economy, and clears the final prerequisite needed to trigger the main house quest.