There was a curious eagerness in his face as he bent down and opened his bag, taking a thin chisel from it, and from his hip pocket he took a revolver. His method was systematic. He began at one corner of the room, and opened every drawer and box he could find. If a drawer were locked, he pried it open. He laid the revolver ready to his hand upon the piece of furniture he was examining. Every drawer he emptied on to the floor. Some of the contents he hardly looked at. Indeed, most of the contents did not interest him. But now and then his attention was closer, and at intervals he seemed puzzled, standing quite still, his hands raised, a finger touching his head, almost as a low comedian does when he wishes the audience to realize that he is in deep thought.
For some time I could not make out what kind of article it was to which he gave special attention, but presently noticed that anything in ivory or bone interested him, especially if it were circular. I remembered the counters in Sir Joseph's room, and wished we had thought to place some in here to see what he would have done with them.
Watching him closely, I was aware that he became more irritable as he proceeded. One small cabinet, which might possess a secret hiding-place, he broke with the chisel, and I noticed that whenever a drawer was locked his scrutiny of the contents was more careful. He evidently expected that the man he was robbing would value the thing he was looking for, and would be likely to hide it securely.
He had worked round half the room when he suddenly stopped, and, with a quick movement, took up the revolver. I had not heard a sound in the house, but he had. There was no sign of doubt in his attitude, which was of a most uncompromising character. He did not make any movement to switch off the light, he did not attempt to conceal himself. He just raised his arm and pointed the revolver toward the door, on a level at which the bullet would strike the head of a man of average height.
The handle was turned, and the door began to open. The next five seconds were full of happenings. For just a fraction of time I realized that the burglar meant to shoot the intruder without a word of warning, and for a moment I seemed unable to utter a sound. Then I shouted:
"Back for your life!"
Immediately there was a sharp report. Quarles had fired from behind the Chesterfield, and the burglar's arm dropped like a dead thing to his side, his revolver falling to the floor.
"Quickly, Wigan!" Quarles cried.
I had dashed aside the curtain, and I threw myself upon the burglar just in time to prevent his picking up his weapon with his left hand. He struggled fiercely, and I was glad of Tresman's help in securing him, although the doctor had come perilously near to losing his life by his unexpected intrusion. But for Christopher Quarles he would have been a dead man.
We called in the police, and, when our prisoner had been conveyed to the station, the professor and I went back to Chelsea.