Once they had reached the open spaces of Charing Cross, and the adjoining Yard where Kings of Scotland had once come to humble themselves before their liege-lord in Whitehall, Daniel could afford to maintain more distance – Isaac's silver hair was easy to pick out in a crowd. And if Isaac's destination was one of the shops, coffee-houses, livery stables, gardens, markets, or noblemen's houses lining the great Intersection, why, Daniel could sit down right about here and spy on him at leisure.