The Adventure of the Abbey Grange by Arthur Conan Doyle

A noblewoman’s abusive husband is found murdered, and Holmes suspects her story of a burglary gone wrong is hiding something. As he investigates, he discovers a tale of long-suffering and forbidden love. The plot challenges Holmes’s typical detachment, and he chooses justice over strict legality. It’s a morally nuanced story about chivalry, restraint, and mercy. One of the most emotionally complex Holmes cases.