with his mysterious mirth.

Rupert turned with impatience and strode swiftly down the court, the rest of us following. When he reached the door of No. 14 he turned abruptly, the revolver glittering in his hand.

"Stand close," he said in the voice of a commander. "The scoundrel may be attempting an escape at this moment. We must fling open the door and rush in."

The four of us cowered instantly under the archway, rigid, except for the old judge and his convulsion of merriment.

"Now," hissed Rupert Grant, turning his pale face and burning eyes suddenly over his shoulder, "when I say 'Four', follow me with a rush. If I say 'Hold him', pin the fellows down, whoever they are. If I say 'Stop', stop. I shall say that if there are more than three. If they attack us I shall empty my revolver on them. Basil, have your sword-stick ready. Now—one, two three, four!"

With the sound of the word the door burst open, and we fell into the room like an invasion, only to stop dead.

The room, which was an ordinary and neatly appointed office, appeared, at the first glance, to be empty. But on a second and more careful glance, we saw seated behind a very large desk with pigeonholes and drawers of bewildering multiplicity, a small man with a black waxed moustache, and the air of a very average clerk, writing hard. He looked up as we came to a standstill.

"Did you knock?" he asked pleasantly. "I am sorry if I did not hear. What can I do for you?"

There was a doubtful pause, and then, by general consent, the Major himself, the victim of the outrage, stepped forward.

The letter was in his hand, and he looked unusually grim.

"Is your name P. G. Northover?" he asked.

"That is my name," replied the other, smiling.

"I think," said Major Brown, with an increase in the dark glow of his face, "that this letter was written by you." And with a loud clap he struck open the letter on the desk with his clenched fist. The man called Northover looked at it with unaffected interest and merely nodded.

"Well, sir," said the Major, breathing hard, "what about that?"

"What about it, precisely," said the man with the moustache.

"I am Major Brown," said that gentleman sternly.

Northover bowed. "Pleased to meet you, sir. What have you to say to me?"

"Say!" cried the Major, loosing a sudden tempest; "why, I want this confounded thing settled. I want—"

"Certainly, sir," said Northover, jumping up with a slight elevation of the eyebrows. "Will you take a chair for a moment." And he pressed an electric bell just above him, which thrilled and tinkled in a room beyond. The Major put his hand on the back of the chair offered him, but stood chafing and beating the floor with his polished boot.

The next moment an inner glass door was opened, and a fair, weedy, young man, in a frock-coat, entered from within.

"Mr Hopson," said Northover, "this is Major Brown. Will you please finish that thing for him I gave you this morning and bring it in?"

"Yes, sir," said Mr Hopson, and vanished like lightning.

"You will excuse me, gentlemen," said the egregious Northover, with his radiant smile, "if I continue to work until Mr Hopson is ready. I have some books that must be cleared up before I get away on my holiday tomorrow. And we all like a whiff of the country, don't we? Ha! ha!"

The criminal took up his pen with a childlike laugh, and a silence ensued; a placid and busy silence on the part of Mr P. G. Northover; a raging silence on the part of everybody else.

At length the scratching of Northover's pen in the stillness was mingled with a knock at the door, almost simultaneous with the turning of the handle, and Mr Hopson came in again with the same silent rapidity, placed a paper before his principal, and disappeared again.

The man at the desk pulled and twisted his spiky moustache for a few moments as he ran his eye up and down the paper presented to him. He took up his pen, with a slight, instantaneous frown, and altered something, muttering—"Careless." Then he read it again with the same impenetrable reflectiveness, and finally handed it to the frantic Brown, whose hand was beating the devil's tattoo on the back of the chair.

"I think you will find that all right, Major," he said briefly.

The Major looked at it; whether he found it all right or not will appear later, but he found it like this:

"What," said Brown, after a dead pause, and with eyes that seemed slowly rising out of his head, "What in heaven's name is this?"

"What is it?" repeated Northover, cocking his eyebrow with amusement. "It's your account, of course."

"My account!" The Major's ideas appeared to be in a vague stampede. "My account! And what have I got to do with it?"

"Well," said Northover, laughing outright, "naturally I prefer you to pay it."

The Major's hand was still resting on the back of the chair as the words came. He scarcely stirred otherwise, but he lifted the chair bodily into the air with one hand and hurled it at Northover's head.

The legs crashed against the desk, so that Northover only got a blow on the elbow as he sprang up with clenched fists, only to be seized by the united rush of the rest of us. The chair had fallen clattering on the empty floor.

"Let me go, you scamps," he shouted. "Let me—"

"Stand still," cried Rupert authoritatively. "Major Brown's action is excusable. The abominable crime you have attempted—"

"A customer has a perfect right," said Northover hotly, "to question an alleged overcharge, but, confound it all, not to throw furniture."

"What, in God's name, do you mean by your customers and overcharges?" shrieked Major Brown, whose keen feminine nature, steady in pain or danger, became almost hysterical in the presence of a long and exasperating mystery. "Who are you? I've never seen you or your insolent tomfool bills. I know one of your cursed brutes tried to choke me—"

"Mad," said Northover, gazing blankly round; "all of them mad. I didn't know they travelled in quartettes."

"Enough of this prevarication," said Rupert; "your crimes are discovered. A policeman is stationed at the corner of the court. Though only a private detective myself, I will take the responsibility of telling you that anything you say—"

"Mad," repeated Northover, with a weary air.

And at this moment, for the first time, there struck in among them the strange, sleepy voice of Basil Grant.

"Major Brown," he said, "may I ask you a question?"

The Major turned his head with an increased bewilderment.

"You?" he cried; "certainly, Mr Grant."

"Can