"Follow me, please." Pinstripes leading them through one self-closing, very heavy door after another. Dark green walls, brief corridors, gloomy watercolor landscapes in ornate gilt frames. Until they reached one particular door, painted a darker green even than the walls, nearly black. A large, italic brass numeral 4, secured with two brass slot-head screws. Pinstripes used a brass knocker on the door frame: a woman’s hand, holding an oblate spheroid of brass. A single respectful tap.