In the Lauriston Garden Mystery the murderer is Jefferson Hope, i want to know that from where he comes in the story because writer didn't mention him throughout the story
From the text:
"Thank God you kept your seat," the other said earnestly. He was a tall, savage-looking young fellow, mounted on a powerful roan horse, and clad in the rough dress of a hunter, with a long rifle slung over his shoulders. "I guess you are the daughter of John Ferrier," he remarked, "I saw you ride down from his house. When you see him, ask him if he remembers the Jefferson Hopes of St. Louis. If he's the same Ferrier, my father and he were pretty thick."
A Study in Scarlet
