“And are you the only witness, Arnold?” Agnes asked.

“The only one who saw the deed done,” he said. “It is very rarely that there is even one witness to the actual fact of a murder. But there is other evidence than mine; the man is supposed to have been seen by various people, and there is a dumb witness of the first importance, the stick which he must have thrown away, or which dropped from his hand in the horror, as I shall always believe of his discovery of what he had done.”

At this point there was a ring as of the glass balls all tinkling together on the board. The doctor turned round, slightly startled in the high tension of his nerves, and saw that Jim had upset his plaything, and that the balls were rolling about the table. But this was far from being an unusual accident in the game, and neither Mrs. Surtees nor Agnes took any notice, their nerves were not strained as Dr. Barrère’s had been. The mother spoke low with a natural thrill of horror and pity. “And is it known,” she said, “is it known to whom the stick belongs?”

Before Dr. Barrère could reply there came a knock to the door—a knock not at the door of the room in which they sat, but below at the street door, a thing unusual indeed at that hour, but not so startling in general as to excite or alarm them.

But perhaps all their nerves were affected more or less. It was very sudden and sharp, and came into the calm domestic atmosphere with a scarcely comprehensible shock. They all turned round, and Jim, the doctor saw, had suddenly risen up, and stood with his face turned towards the door. The summons rang through the silence with an effect altogether out of keeping with its simplicity.

“Who can that be so late,” said Mrs. Surtees. “Jim, will you go and see?”

“It must be some one for me,” the doctor said.

“Poor Arnold! I hope it is someone near,” said Agnes faltering—for neither of them believed what they said. It was something terrible, something novel, some startling new event whatever it was. Jim, instead of doing as his mother wished, sat down again behind the writing-table, within the shelter of the red shades on the candles, and they all waited, scarcely venturing to draw breath. Presently the neat parlor-maid, pale, too, and with a visible tremor, opened the door. She said, with a troubled look at her mistress, that, “Please, there was some one down stairs who wanted to speak to Mr. Jim.” Mrs. Surtees was the last to be moved by the general agitation. She said, “For Mr. Jim? But let him come up, Ellen. Jim, you had better ask your friend to come upstairs.”

Once more there was a terrible, incomprehensible pause. Jim, who had fallen rather than re-seated himself on the sofa which stood behind the writing-table, said not a word; his face was not visible behind the shaded lights. Mrs. Surtees threw a glance round her—a troubled appeal for she knew not what enlightenment. Then she said breathlessly, “What has happened? What is the matter? Who is it? Ellen, you will show the gentleman up stairs.”