"The Putney mystery," said the _Daily Megaphone_, "surpasses any of recent years in its sensational character. There is a touch of the bizarre in this grim spectacle of the dead man at the door of the empty house, and the swaying figure of his murderer hanging in the kitchen, with no other mark of identification than a playing card pinned to his breast.

"The tragedy can be reconstructed up to a point. Mr. White was evidently killed in the garden by the Frenchman who was found hanging. The automatic pistol in his pocket, which had recently been discharged, might support this theory even if the police had not found tracks of his feet in the laurels. But who hanged the man Raoul with a hangman's rope? That is the supreme mystery of all. The Putney police can offer no information on the subject, and Scotland Yard is as reticent. The circumstances of the discovery are as follows. At three o'clock on the morning of the 4th, Police-Constable Robinson, who was patrolling his beat, entered the garden, as is customary when houses are empty, to see if any doors had been forced. There had been an epidemic of burglaries in the region of Putney Heath during the past two or three months, and the police are exercising unusual vigilance in relation to these houses. The constable might not have made his inspection that night but for the fact that the garden gate had been left wide open...."

Here followed an account of how the body was found and how further investigation led the constable to the kitchen to make his second gruesome discovery.

Colonel Boundary folded up the paper slowly and put it down. He had bought a copy of an early edition of the evening newspaper as he was stepping into his car, and now he was driving slowly through the park. He lit a cigar and gazed stolidly from the window. But his face showed no sign of mental perturbation.

The car had made the circuit of the Park twice when, turning again by Marble Arch, he saw Crewe standing on the sidewalk. A word to his chauffeur, and the machine drew up.

"Come in," he said curtly, and the other obeyed.

The hand that he lifted to take his cigarette from his lips trembled, and the colonel eyed him with quiet amusement.

"They've got you rattled too, have they?" he said.

"My God! It's awful!" said Crewe. "Awful!"

"What's awful about it?" asked the colonel. "White's dead, ain't he? And Raoul's dead, ain't he? Two men who might talk and give a lot of trouble."

"What did he say before he died? That's what I've been thinking. What did he say?"

"Who? Raoul?" demanded the colonel. He had asked himself the same question before. "What could he say? Anyway, if he had a statement to make, and his statement was worth taking, why, he'd be alive to-day! Raoul was the one witness that they wanted, if they only knew it. They've bungled pretty badly, whoever they are."

"This Jack o' Judgment," quavered Crewe, his mouth working. "Who is he? What is he?"

"How do I know?" snarled the colonel. "You ask me these fool questions--do you expect a reply? They're dead, and that's done with. I'd sooner he killed Raoul than made a mess of my room, anyway!"

"Why did he do it?" asked Crewe.

The colonel growled something about fools and their questions, but offered no explanation.

"It may have been a monkey trick to make us change, our quarters--the stuff was sulphuretted hydrogen and asafoetida. It may have been just bravado, but if he thinks he can scare me----"

He sucked viciously at his cigar end.

"I've got workmen in to strip the walls and re-paper the bit that's soiled," he said. "I'll be back there to-night."

The colonel threw the end of his cigar from the window and relapsed into moody reverie. When he spoke it was in a more cheerful tone.

"Crewe," he said, "that guy at Scotland Yard has given me an idea."

"Which guy?" asked Crewe, steadying his voice.

"The First Commissioner," said the colonel, lighting another cigar. "He particularly wanted to know if 'Snow' had any relations. Curse 'Snow'!" he said between his teeth, and dropping his mask of urbanity. "I wish he'd--well, it doesn't matter; he's dead, anyway--he's dead."

"Relations?" said Crewe. "Did you tell him anything?"

"I told him all I knew, and that was very little," said the colonel, "but it struck me that Sir Stanley knows much more about this fellow 'Snow' than we do. At any rate, somebody's been making inquiries, and I guess that somebody is the fellow who settled Raoul."

"Jack o' Judgment?"

"Jack o' Judgment," repeated the colonel grimly. "You showed 'Snow' Gregory into the gang--what do you know about him?"

Crewe shook his head.

"Very little," he said. "I met him in Monte Carlo. He was down and out. He seemed a likely fellow--educated, a gentleman and all that sort of thing--and when I found that he'd hit the dope, I thought he'd be the kind of man you might want."

The colonel nodded.

"He never talked about his relations. The only thing I know was that he had a father or an uncle, who was in India, and I gathered that he had forged his name to a bill. When I arrived in Monte Carlo he was spending the money as fast as he could. I guess that was why he called himself Gregory, for I'm sure it wasn't his name."

"You're sure he never spoke of a brother?"

"Never," said Crewe; "he never talked about himself at all. He was generally under the influence of dope or was recovering from it."

The colonel pushed back his hat and rubbed his forehead.

"There must be some way of identifying him," he said. "He came from Oxford, you say?"

"Yes, I know that," said Crewe; "he spoke of it once."

"What house in Oxford? There are several colleges, aren't there?"

"From Balliol," said Crewe. "I distinctly remember him talking about Balliol."

"What year would that be?"

Crewe reflected.

"He left college two years before I met him at Monte Carlo," he said; "that would be----" He gave the year.

"Well, it is pretty simple," said the colonel. "Send a man to Oxford and get the names of all the men that left Balliol in that year. Find out how many you can trace, and I dare say that will narrow the search down to two or three men. Now get after this at once, Crewe. Spare no expense. If it costs half a million I'm going to discover who Mr. Jack o' Judgment is when he's at home."

He dismissed Crewe and gave fresh instructions to his driver, and ten minutes later he was stepping out of his limousine at the entrance to Scotland Yard.

Stafford King was not in, or at any rate was not available. Greatly daring, the colonel sent hi............