Twelve cases arrive at 221B Baker Street — a king blackmailed by a photograph, a pawnbroker paid to copy out an encyclopedia, a stepdaughter dying with a scream about a speckled band — and Sherlock Holmes reads each visitor's mud-spattered boots and frayed cuffs before they have finished sitting down. Doyle, narrating through the patient Dr. Watson, turns deduction into theatre: the impossible knot, the offhand chain of reasoning, the quiet reveal that it was obvious all along. The collection that made the detective story a genre and Baker Street an address the whole world still writes to.