How do you unlock the "The Iniquities of History" stranger mission?

The ''The Iniquities of History'' stranger mission in Red Dead Redemption 2 is a multi-part questline that involves uncovering the dark past of the Braithwaite family. To unlock this mission, you must first progress through Chapter 4 of the main story. This mission is tied to the Braithwaite family''s secrets and becomes available after completing the main mission ''Revenge is a Dish Best Eaten.'' Once you reach this point, the mission will trigger automatically as part of the story progression.\n\nTo begin the mission, head to the Braithwaite Manor, located in the Scarlett Meadows region of Lemoyne. The manor is a large plantation estate southeast of Rhodes. Upon arriving, you will encounter a character named Professor Andrew Bell III, who is investigating the history of the Braithwaite family. He will approach you and ask for your assistance in uncovering the family''s hidden secrets. This interaction will officially start the mission.\n\nDuring the mission, you will need to explore the Braithwaite property and search for clues. One of the key locations is the old slave quarters behind the manor. Here, you will find a hidden cellar that contains important documents and artifacts. To access the cellar, you must interact with a specific wooden hatch on the ground. This hatch is partially hidden, so look carefully near the back of the slave quarters.\n\nOnce inside the cellar, you will need to search for a specific item: a family heirloom. This item is crucial for progressing the mission. It is located in a locked box, which requires a key. The key can be found on a nearby table or in the possession of a Braithwaite family member. If you encounter resistance from the family, be prepared to defend yourself. The Braithwaites are hostile, and combat may be necessary.\n\nAfter retrieving the heirloom, return to Professor Bell to complete the first part of the mission. He will provide additional tasks, including investigating other locations tied to the Braithwaite family''s history. These tasks often involve traveling to specific points of interest, such as abandoned buildings or hidden gravesites. Pay close attention to the clues provided, as they will guide you to the next objective.\n\nOne common challenge players face during this mission is navigating the Braithwaite property without alerting the family. To avoid detection, use stealth mechanics such as crouching and moving slowly. If you are spotted, the mission will not fail, but it may become more difficult due to increased enemy presence. Additionally, ensure you have enough ammunition and health items, as combat can be intense.\n\nPractical tips for completing ''The Iniquities of History'' include saving your game before starting the mission. This allows you to retry if something goes wrong. Also, consider upgrading your weapons and stocking up on supplies beforehand. The mission rewards include unique items and valuable insights into the game''s lore, making it a worthwhile endeavor for both new and experienced players.