That made Grant think of motive, and he considered the more obvious ones: theft, revenge, jealousy, fear. The first was ruled out; the man's pockets could have been picked half a dozen times by an expert practitioner in such a crowd, without any more violence than a fly bestows in alighting. Revenge or jealousy? Most probably — Levantines were notoriously vulnerable in their feelings; an insult rankled for a lifetime, a straying smile on the part of their adored, and they ran amok. Had the man with the hazel eyes — he had, undoubtedly, been attractive — come between a Levantine and his girl?

For no reason whatever Grant did not think so. He did not for a moment lose sight of the possibility, but — he did not think so. There remained fear. Was the fully loaded revolver prepared for the man who slid that sliver of steel into the owner's back? Had the dead man intended to shoot the Levantine on sight, and had the assassin known it and lived in terror? Or was it the other way about? Was it the dead man who had carried a weapon of defense which had not availed him? But then there was the unknown man's desire to slough his identity. A loaded revolver in these circumstances pointed to suicide. But if he contemplated suicide, why postpone it while he went to the play? What other motive induced a man to make himself anonymous? A brush with the police — arrest? Had he intended to shoot some one and, afraid of not getting away, made himself nameless? That was possible.

It was fairly safe, at least, to suppose that the dead man and the man whom Grant had mentally christened the Levantine had known each other sufficiently well to knock sparks from each other. Grant had very little belief in secret societies as the origins of picturesque murders. Secret societies delighted in robbery and blackmail and all the more squalid methods of getting something for nothing, and there was seldom anything picturesque about them, as he knew from bitter experience. Moreover, there were no impressive secret societies in London at present, and he hoped they would not start. Murder to order bored him stiff. What interested him was the possible play of mind on mind, of emotion on emotion. Like the Levantine and the unknown. Well, he must do his best to find out who the Unknown was — that would give him a line on the Levantine. Why had no one claimed him? It was early yet, of course. He might be recognized by some one at any minute. After all, he had only been «missing» to his people for the space of a night, and not many people rush to see a murdered man because their son or brother has stayed out for the night.

With patience and consideration and an alert mind, Grant interviewed the seven people he had set out to see quite literally to see. He had not anticipated receiving information from them directly, but he wanted to see them for himself and to sum them up. He found them all going about their various business with the exception of Mrs. James Ratcliffe, who was prostrate in bed and being attended by the doctor, who deplored the nervous shock she had received. Her sister — a charming girl with hair the colour of honey — talked to Grant. She had come into the drawing-room quite obviously hostile to the thought of any police officer being admitted to her sister in her present state. The sight of the police officer in reality was so astonishing that she looked again at his card quite involuntarily, and Grant smiled inwardly a little more broadly than he permitted himself outwardly.

"I know you hate the sight of me," he said apologetically — and the tone was not wholly acting — "but I wish you would let me talk to your sister for just two minutes. You can stand outside the door with a stopwatch. Or come in, if you like, of course. There is nothing at all private in what I want to say to her. It's only that I am in charge of the investigations in this case, and it is my duty to see the seven people who were nearest the man last night. It will help me enormously if I can write them all off the slate tonight and start on fresh lines tomorrow. Don't you see? It's mere form but very helpful."

As he had hoped, this line of argument was a success. After a little hesitation the girl said, "Let me go and see if I can persuade her." Her report of the inspector's charms must have been a rose-coloured one, for she came back in less time than he had dared to hope and took him up to her sister's room, where he had an interview with a tearful woman who protested that she had not even noticed the man until he had fallen, and whose wet eyes regarded him continually with a dreadful curiosity. Her mouth was hidden behind a barricade of handkerchief which she kept pressed to it. Grant wished that she would take it down for a moment. He had a theory that mouths gave away more than eyes — certainly where women were concerned.

"Were you standing behind him when he fell?"

"Yes."

"And who was alongside him?"

She could not remember. No one was paying attention to anything but getting into the theatre, and in any case she never noticed people on the street.

"I'm sorry," she said shakily, when he was taking his departure. "I'd like to be of use if I could. I keep seeing that knife, and I'd do anything to have the man that did it arrested." And as Grant went out he dismissed her from his mind.

Her husband, whom he had to travel into the City to see — he could have had them all to the Yard, but he wanted to see how they were occupying their time on this the first day after the murder — was more helpful. There had been a fair amount of churning in the queue, he said, as the doors were opened, so that their relations with their neighbors had altered a bit. As far as he could remember, the person who had stood beside the dead man and in front of himself was a man who had belonged to a party of four in front of that again, and had gone in with them. He, like his wife, said that he had not consciously seen the man until he had fallen.

The other five Grant found equally innocent and equally unhelpful. None had noticed the man. That amazed Grant just a little. How had no one seen him? He must have been there all the time. One doesn't shove in at the head of a queue without attracting a most uncomfortable amount of attention. And even the most unobservant of people will recall what their eyes have seen even if they were unconscious of taking notice at the time. Grant was still puzzling when he got back to the Yard.

There he sent a notice to the Press which asked any one who had seen a man leave the queue to communicate with Scotland Yard. Also a full description of the dead man, and as much of the progress of the investigations as was to be given to the public. Then he summoned Williams and demanded an account of his stewardship. Williams reported that the dead man's fingerprints had been photographed according to instructions and sent up for investigation, but he was unknown to the police. No corresponding fingerprints were to be found among those betraying dockets. The revolver expert could find nothing individual about the revolver. It was probably second hand, had been used quite a lot, and was of course a very powerful weapon.

"Huh!" said Grant disgustedly. "Some expert!" and Williams smiled.

"Well, he did say there was nothing distinctive about it," he reminded.

And then he explained that before sending the revolver to the experts he had tested it for fingerprints, and finding quite a lot had had them photographed. He was now waiting, for the prints.

"Good man," said Grant, and went in to see the superintendent, carrying the Print of the dead man's fingertips with him. He gave Barker a précis of the day's events without adducing any theories about foreigners beyond remarking that it was a very un-English crime.

"Precious unproductive kind of clues we've got," said Barker. "All except the dagger, and that's more like something out of a book than part of an honest-to-goodness crime."