“I shall be very glad to know why,” Smeaton replied, goaded into a half-admission by the contemptuous tone of the other man.

“Because, although you have some very clever men here you want a leavening of men of different calibre. It is good to know every corner of the slums, to be acquainted with every incident in the career of burglar Bill and light-fingered Jack, to know the haunts of all the international thieves and forgers and anarchists. That is sound and useful knowledge.”

“I am glad you think so,” said Smeaton sarcastically.

“In a case like this, however, you want another sort of knowledge altogether,” pursued Mr Boyle, callously indifferent to the detective’s sarcasm. “You want a man who has mixed in the big world from his boyhood, who knows all the ins and outs, all the intrigue of social life, all the gossip, all the scandal that has been going round the clubs and drawing-rooms for the last forty years.”

“In other words, men like yourself—eh? We have plenty such in our pay.”

“But they are not a recognised part of your official organisation,” rejoined Mr Boyle quickly. “As you are kind enough to suggest myself,” he added modestly, “I think I may say that in certain cases I should earn my salary. But I admit that at the burglar business I should be no use at all.”

There was a long silence. Smeaton was trying to smother his indignation. He had taken a dislike to the man from the first moment he had set eyes upon him. His long-windedness, his self-conceit, his grotesque gestures, his assumption of superiority, his gibes at Scotland Yard methods, had added to it. But he must bear with him; he was sure that Boyle had something more to say before he took his leave.

Mr Boyle pursued his discourse, quite unconscious of the other’s antipathy.

“In spite of troubles that would have crushed a weaker man, I think I have worn well: I am frequently taken for ten years younger than I am. As a fact, there is only one year’s difference between Monkton and myself. We were at a tutor’s together, and we went up to Cambridge in the same year.”

Smeaton breathed a sigh of relief. He had an intuition that at last this exasperating person was coming to the point.