The Darkness of Saxe-Koburg Square

Vincent Spalding, who's actually called John Clay, has been planning to steal the money. And so there they are in the cellar, surrounded by the gold, which is going to be stolen. Holmes: "They've got like a gas lantern, probably, which is lighting up the room, and it's time to cover it up" Watson: "Such an absolute darkness as I have never before experienced... The smell of hot metal remained."