“You are wrong,” he protested. “We were bound, in any case, to know one another. Shall I tell you why? You have just declared yourself anxious to set your heel upon the criminals of the world. I have the distinction of being perhaps the most famous patron of that maligned class now living—and my neck is at your service.”

“You appear to me,” Francis said suavely, “to be a buffoon.”

It might have been fancy, but Francis could have sworn that he saw the glitter of a sovereign malevolence in the other's dark eyes. If so, it was but a passing weakness, for a moment later the half good-natured, half cynical smile was back again upon the man's lips.

“If so, I am at least a buffoon of parts,” was the prompt rejoinder. “I will, if you choose, prove myself.”

There was a moment's silence. Wilmore was leaning forward in his place, studying the newcomer earnestly. An impatient invective was somehow stifled upon Francis' lips.

“Within a few yards of this place, sometime before the closing hour to-night,” the intruder continued, earnestly yet with a curious absence of any human quality in his hard tone, “there will be a disturbance, and probably what you would call a crime will be committed. Will you use your vaunted gifts to hunt down the desperate criminal, and, in your own picturesque phraseology, set your heel upon his neck? Success may bring you fame, and the trail may lead—well, who knows where?”

Afterwards, both Francis and Andrew Wilmore marvelled at themselves, unable at any time to find any reasonable explanation of their conduct, for they answered this man neither with ridicule, rudeness nor civility. They simply stared at him, impressed with the convincing arrogance of his challenge and unable to find words of reply. They received his mocking farewell without any form of reciprocation or sign of resentment. They watched him leave the room, a dignified, distinguished figure, sped on his way with marks of the deepest respect by waiters, maitres d'hotels and even the manager himself. They behaved, indeed, as they both admitted afterwards, like a couple of moonstruck idiots. When he had finally disappeared, however, they looked at one another and the spell was broken.

“Well, I'm damned!” Francis exclaimed. “Soto, come here at once.”

The manager hastened smilingly to their table.

“Soto,” Francis invoked, “tell us quickly—tell us the name of the gentleman who has just gone out, and who he is?”