
People project their own obsessions onto the unknown.
Sir Wilson Seymour sees a graceful figure, Captain Cutler sees a brutal beast, and Father Brown sees his own clerical hat with horned corners reflected in a dark mirror. In a Paris duel, Dr. Paul Hirsch and Colonel Dubosc orchestrate public drama over secret formulas to satisfy nationalist vanity. Criminals and witnesses alike invent elaborate spectacles—sham Italian brigands and staged duels—to conceal simple greed and fraud.
THREE — The Duel of Dr Hirsch → FOUR — The Man in the Passage

