"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 his card to the First Commissioner. Sir Stanley Belcom read the name and raised his eyebrows.