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There are many interesting places to find in Redfall's open world if you're willing to head off the beaten path. For example, there is a mysterious building known as The Blackwood House. It doesn't contain enemies or threats of any kind. Instead, it has a few locked doors.
As this is a video game, you can't just leave a few sealed doors alone. You have to attempt to open them, and there is a way. Once you do, you get a few cool items, including a blood remnant that grants you the Sisterhood achievement. But to get them, you must find the keys first. This is where to locate each one.
Where To Find Blackwood House
Before you can do anything, you need to know where the Blackwood House is located.
It's in the Founder's Knoll region of Burial Point. You can find it right next to the Windy Stead landmark and northeast of the Founder's Knoll Safehouse.
In the living room of the house, you can find a map containing photos that serve as clues to the keys' whereabouts.
Where To Find The Key To Hester's Room
On the map, this one looks to be close to the Founder's Knoll safehouse. However, the safehouse is in a tunnel while the key is above ground.
The key to Hester's Room isn't too far from Blackwood House, as it's still in the Founder's Knoll region. Simply head down the road to the south.
While going down the road, you will eventually reach the entrance to Smith's Family Orchard. Walk a bit past that and turn right to see a path up a hill.
At the top of it is a gazebo with the key underneath.
Where To Find The Key To Agnes' Room
To find the key to Agnes' room, you must head to the Haven's Lot region in Burial Point. The key is on the eastern edge of the area.
To reach it, you must head off the main road and make your way up a hill. Up there, you will find a cave.
Go inside to find the key at the bottom near some cultists.
Where To Find The Key To Katherine's Room
For Katherine's room key, you have to head to the Direcliff region. The key is located directly north of the Direcliff safehouse.
However, you have to head to the key from the west side since that's the way you get up the mountain, which you need to do to reach what you desire.
You will need to go through multiple campsites to get there. You will know when you're nearly there because you will be on the east edge of the mountain. At the spot is a small cave opening.
Go inside to find the key on a rock.
Where To Find The Key To The Basement
The Basement Key is actually already in the Blackwood house. Interestingly, it doesn't have a set place.
The key will be in whichever is the last room you open upstairs. So, it could be in Hester's room, Katherine's room, or Agnes' room.
It'll be next to a journal.
Once you go down into the basement and grab the blood remnant, the Sisterhood achievement will pop.