This time, after coming up the Hudson as far as Albany, Frank and his father had headed west. First they’d taken a coach along the old turnpike road across the northern lip of the Catskills to Syracuse, then along the top of the long, thin Finger Lakes, past Seneca and Geneva, and after that, all the way across to Batavia and finally Buffalo. It had taken many days.

Frank reckoned he knew why his father had brought him. Of course, he was the only boy in the family, but it wasn’t only that. He liked to know how things worked. At home, he enjoyed it when his father took him onto the steamboats and let him inspect their furnaces and the pistons. “It’s the same principle as the big steam-powered cotton gins they have in England,” Weston had explained. “The plantations we finance in the South mostly produce raw cotton, which we ship across the ocean to those gins.” Sometimes Frank would go down to the waterside to watch the men packing the cargoes of ice, so that it would stay frozen all the way down to the kitchens of the big houses in tropical Martinique. When the workmen had installed gas lighting in their house that spring, he’d watched every inch of piping as it went in.

So it was only natural, he supposed, that his father should have chosen him of all his children to accompany him now, to witness the opening of the huge engineering project in the North.

Weston Master took a draw on his cigar. The path was like a tunnel, but a short way ahead there was an arch of bright sky, where the trees ended. He glanced down at his son and smiled to himself. He was glad to have Frank with him. It was good for a boy to spend time alone with his father. And besides, there were some particular things he wanted to share with his son on this journey.