murmur. He was hungry, and he did not care where he ate so that the food was good, and except for the fact that the table was directly outside the service door there was no fault to be found with it. A couple of green draught-screens camouflaged the door, and the door, being a swing one, kept the rattle of crockery to a faint castanet music that blossomed every now and then in a sudden fortissimo as the door swung wide and closed again. Over their dinner Grant decided that in the morning Williams should visit the banks in the area indicated by the letter's postmark, and with that as a basis, track down the history of the bank-notes. It shouldn't be difficult; banks were always accommodating. From that they turned to the discussion of the crime itself. It was Williams' opinion that it was a gang affair; that the dead man had fallen foul of his gang, had known his danger, had borrowed the gun from the only friendly member of the crowd, and had never had a chance to use it. The money that had arrived tonight had come from the secretly friendly one. It was a good enough theory, but it left out things.
"Why had he no identification marks on him, then?"
"Perhaps," said Williams with electrifying logic, "it's a gang habit. No identification if they're caught."
That was a possible theory, and Grant was silent for a little, thinking it over. It was with the entrée that he became conscious, with that sixth sense which four years on the western front and many more in the C.I.D. had developed to an abnormal acuteness, that he was being watched. Restraining the impulse to turn round—he was sitting with his back to the room, almost facing the service door—he glanced casually into the mirror. But no one seemed to be taking the slightest interest in him. Grant continued to eat, and in a moment or two tried again. The room had emptied considerably since their arrival, and it was easy to examine the various people in the vicinity. But the mirror showed only a collection of self-absorbed people, eating, drinking, and smoking. And still Grant had that sense of being subjected to a long scrutiny. It made his flesh creep, that steady, unseen examination. He lifted his eyes above Williams' head to the screen that hid the door. And there, in the chink between the screens, were the eyes that watched him. As if conscious of his discovery, the eyes wavered and disappeared, and Grant went serenely on with his meal. A too curious waiter, he thought. Probably knows who I am, and just wanted to gape at any one connected with a murder. Grant had suffered much from the gapers. But presently, looking up in the middle of a sentence, he found the eyes back at their examination of him. This was too much. He stared stolidly in return. But the owner of the eyes was evidently unaware that he was visible at all to Grant, and continued his watching uninterrupted. Now and then as a waiter came or went behind the screen the eyes disappeared, but always they returned to their furtive gazing. Grant was seized with a desire to see this man whose interest in himself was of so absorbing a character. He said to Williams, who was seated not more than a yard in front of the screen, "There is some one at the back of the screen behind you who is taking a most abnormal interest in us. When I click my fingers fling back your right and knock the screen sideways. Make it look as much like an accident as you can."
Grant waited until the waiter traffic had lulled for a little and the eyes were steady at gaze, and then gently snapped his middle finger and thumb. Williams' brawny arm shot out, the screen quivered for a moment and collapsed sideways. But there was no one there. Only the agitated swinging of the door showed where some one had made his hasty exit.
Well, that's that, thought Grant, as Williams was apologizing for the accident with the screen. You can't identify a pair of eyes. He finished his dinner without further annoyance and strolled back to the Yard with