Sir Daniel sat thinking. He had trained himself to think methodically and he hated slipshod ideas as much as he despised a vague diagnosis. He was, he liked to tell his friends, above all things, a creature of method and routine. He prided himself upon his memory. His memory was busy now with events only seven hours old. He closed his eyes and saw himself in the entrance-hall of Marsdon House at four o’clock that morning. The last guests, wrapped in coats and furs, shouted cheerfully to each other and passed through the great doors in groups of twos and threes. Dimitri stood at the foot of the stairs. He himself was near the entrance to the men’s cloakroom. He was bent on avoiding Lucy Lorrimer, who had stayed to the bitter end, and would offer to drive him home if she saw him. There she was, just going through the double doors. He hung back. Drifts of fog were blown in from the street. He remembered that he had wrapped his scarf over his mouth when he noticed the fog. It was at that precise moment he had seen Mrs Halcut-Hackett, embedded in furs, slip through the entrance alone. He had thought there was something a little odd about this. The collar of her fur wrap turned up, no doubt against the fog, and the manner in which she slipped, if so majestic a woman could be said to slip, round the outside of the group! There was something furtive about it. And then he himself had been jostled by that fellow Withers, coming out of the cloakroom. Withers had scarcely apologized, but had looked quickly round the melting group in the hall and up the stairs.

It was at that moment that Lord Robert Gospell had come downstairs. Sir Daniel twisted the heavy signet ring on his little finger and still with closed eyes he peered back into his memory. Withers had seen Lord Robert. There was no doubt of that. Sir Daniel heard again that swift intake of breath and noticed the quick glance before the fellow unceremoniously shoved his way through the crowd and disappeared into the fog. Then Lord Robert’s nephew, young Donald Potter, came out of the buffet near the stairs. Bridget O’Brien was with him. They almost ran into Lord Robert, but when Donald saw his uncle he sheered off, said something to Bridget, and then went out by the front entrance. One more picture remained.

Bunchy Gospell speaking to Dimitri at the foot of the stairs. This was the last thing Sir Daniel saw before he, too, went out into the fog.