At first Rathbone decided to go home and have a long, quiet evening turning the case over in his mind to see if he could discover something which had so far eluded him. But the prospect was unpromising, and he had been in his study only half an hour, unable to relax, when he abandoned the whole idea and told his manservant that he was going out and did not know when he would be back.

He took a hansom all the way to Primrose Hill, where his father lived, and arrived just as the shadows were lengthening and the sun was going down in a limpid sky.

Henry Rathbone was at the far end of the long lawn staring at the apple trees whose gnarled branches were thick with blossom buds. He was a taller man than his son, and leaner, a little stooped with constant study. Before his retirement he had been a mathematician and sometime inventor. Now he dabbled in all sorts of things for pleasure and to keep his mind occupied. He found life far too interesting to waste a day of it, and all manner of people engaged his attention. His own parents had been of humble stock; in fact, his maternal grandfather had been a blacksmith and wheelwright. He made no pretensions to superiority, except that when he judged a man to have sufficient intelligence to know better, he suffered fools with great impatience.

"Good evening, Father," Rathbone called as he stepped through the French doors across the paved terrace and onto the grass.

Henry turned with surprise.

"Hello, Oliver! Come down and look at this. Do you know the honeysuckle in this hedge flowered right on until Christmas, and it's coming well into leaf again already. And the orchard is full of primroses. How are you?" He regarded his son more closely. The evening light was very clear and perhaps more revealing than the harsher sun would have been. "What is wrong?"

Oliver reached him and stopped. He put his hands in his pockets and surveyed the hedge with the aforementioned honeysuckle twined through it, and the bare branches of the orchard beyond. His father frequently read him rather too easily.

"Difficult case," he answered. "Shouldn't really have taken it on in the first instance. Too late now."

Henry started to walk back towards the house. The sun was barely above the trees and any moment it would disappear. There was a golden haze in the air and it was appreciably colder than even a few minutes before. A cloud of starlings wheeled above a distant stand of poplars, still bare, although in the next garden a willow trailed weeping branches like streamers of pale chiffon. The breeze was so slight it did not even stir them.