Help a Brother Out is an Optional Honor Story Mission in Red Dead Redemption 2. This Walkthrough shows how to complete this Mission, which is marked as a Stranger Quest on the map initially. Playing it is required for the missable Lending a Hand trophy.
Quest Giver: Brother Dorkins
Region: Saint Denis
Requirements: having finished The Joys of Civilization (early Chapter 4)
Help a Brother Out Starting Location
After the first mission of Chapter 4, Arthur can find a monk in eastern Saint Denis, asking for a donation. Doing so gives a small positive honor boost. The monk tells us that despite it being 1899, there are still slaves around this city, waiting to be sold.
He leads us to the Fence-Shop around the corner.
You could ask the Shopkeeper, but that voids one of the Gold Medal Requirements (and costs time, which is the second Requirement).
Simply interact with the red book on the shelf. You can already see the markings on the floor, indicating this shelf can be moved.
Head down, free the two captives and return to Dorkins.
In the end, you can earn another small honor boost, by declining his offer to keep the money. Let him keep it for the poor.
This concludes the “Help a Brother Out” Mission in Red Dead Redemption 2 (RDR2). For all other Stranger Missions check out the full Red Dead Redemption 2 Stranger Missions Walkthrough.