Richard Duvall, accompanied by the silent little curio dealer, left the home of the French Ambassador and walked rapidly to the barber shop of Alphonse Perrier in Piccadilly Circus. They found the place without difficulty, a large and evidently prosperous establishment, located on the ground floor of a building, the upper rooms of which were devoted to business offices. A large plate glass window in front bore the sign, "Alphonse Perrier, Tonsorial Parlors."

The detective and his companion walked slowly past the brightly lighted window, their eyes taking in the details of the interior of the place. It was now close to ten o'clock, but the street was filled with pedestrians, and there were still one or two customers in the shop. At the first chair toward the door stood a large pasty-faced man, with a mop of bushy black hair, who was engaged in trimming a young man's mustache. The second chair was occupied by a man who was being shaved. The fellow who was shaving him answered in a general way to the descriptions of Seltz given by the Ambassador's servants. The third chair was unoccupied, and the man in charge of it, as well as those at the remaining two chairs, were engaged in putting away their razors and brushes, preparatory to leaving. It was evident that the closing hour was near at hand.

Duvall turned to his companion, "Monsieur Dufrenne," he said, "will you enter at once and take the third chair? Keep your eyes and ears open, and see what you can learn. I will wait here in the shadow of the next doorway. Our man is evidently inside. He will soon be leaving the shop. If he does so, before you do, I shall follow him. In that event, return to Monsieur de Grissac's house and wait there for word from me."

Dufrenne felt his stubbly beard. "It is fortunate, monsieur, that I have not been shaved since Monday," he said, as he entered the shop.

The man in charge of the third chair looked at him with a sulky expression as he took his seat. His companions grinned. Evidently he had not expected another customer before the closing hour. He began to shave the little old Frenchman with careless haste. The latter lay in his chair, with half-closed eyes, pretending to doze. In reality he was watching every movement of the man next to him.

The customer who occupied the second chair was a small, thin man, with sandy hair and a bony face. His eyes, rather prominent, under sparse red eyebrows, were closed as though in sleep. He was not paying the slightest attention to his surroundings, taking no notice whatever of Seltz, who was going over his face in a stolid and methodical way. There seemed nothing about either of them to attract attention—and Dufrenne began to wonder whether they might not after all be upon a false scent. The man Seltz showed neither haste nor nervousness in his movements—if he was in a hurry to finish his work for the evening, and leave the place, he certainly did not show it.

After a time, Dufrenne observed that the thin man in the chair next to him had opened his eyes, and was feeling his jaw with much satisfaction. "A very good shave, my good fellow," he said, in excellent English, without a trace of any foreign accent. "What powder was that you used, may I ask?"

Dufrenne, who was observing Seltz carelessly, saw a sudden change come over him. His eyes lit up with interest, and a slight flush overspread his face. There seemed nothing in so simple a question to arouse him in this way, and Dufrenne watched him carefully, his senses keenly alert for anything of interest. To his disappointment, Seltz's answer was of the most commonplace character. "It is a special kind, which Monsieur Perrier has made for him, after his own formula. 'Poudre Perrier,' it is called." He turned to the case behind him, opened a drawer and brought forth a round cardboard box. "Eightpence is the price. Would you like to try a box?" He extended the package toward his customer, who had risen and was adjusting his scarf at the mirror.

The man turned and glanced carelessly at the box. "Oh, you might wrap it up. I shave myself, occasionally, when I'm traveling. Eightpence, you say?"

"Yes, sir." Seltz turned to the case and began to do up the package in a piece of brown paper. In a few moments he turned and handed it to his customer, who had drawn on his coat, and was preparing to leave the place. Dufrenne saw him put his hand into his pocket and draw out some money, which he handed to Seltz. The latter nodded gravely and placed it in his pocket. The thin-faced man did the same with the package, then left the shop. There was nothing in the least suspicious about the whole transaction, and the little Frenchman contented himself with observing Seltz as he put away his brushes and prepared to stop work for the day. Once he saw the man draw something from his pocket and glance hurriedly at it, but his back was toward the chair in which Dufrenne sat, and he could not see what it was. A sense of uneasiness filled him, however, as the man who was shaving him drew away the sheet from about his shoulders and stepped back to allow him to rise.

He made his way to the street as quickly as possible. Seltz was still occupied in putting away his shaving implements.

On reaching the pavement, Dufrenne turned and walked rapidly toward Charing Cross. He did not wish to join Duvall in sight of those within. He had taken but a few paces when the latter caught up to him. "What did you learn?" the detective asked, quickly.

Dufrenne related in a few words what had occurred in the shop. He failed to note the excitement with which the detective listened to his story. "It may have been the snuff box," Duvall cried, moving forward rapidly in his excitement. "A clever scheme, I must say." He looked about eagerly for the man who had left the shop so short a time before, but he had disappeared in the darkness. "If you could only have warned me in some way."

"It was impossible, monsieur," said Dufrenne much crestfallen. "I could not leave the chair until the man had finished shaving me."

"Of course not," replied Duvall, uncertain what course to pursue next. "The man went in this direction. I noticed him particularly. Perhaps if I were to hurry I might overtake him." He started forward. "You stay here and watch Seltz. If I do not return, report to me at Monsieur de Grissac's." He turned and disappeared in the crowd.

Dufrenne went slowly back to the neighborhood of the shop, and stood in the shadow of the doorway, waiting. Presently he observed two of the assistants, in street clothes, leave the place and hurry off into the darkness. Neither of them was Seltz. The lights in the shop began to go out. Another assistant left. Only Seltz and the proprietor now remained within. He crept toward the window, and cautiously looked inside. Monsieur Perrier stood before one of the mirrors, arranging his bushy hair. There was no one else in the shop.