"But," objected Fandor in the same key, "what if I lose sight of him?"
"No fear of that. The doctor's house is the second on the right." The hooligan, who had for a moment drawn near the crowd, was now heading straight for the Cité.
Juve went on: "In a quarter of an hour at the latest join me again, 27 Rue Victor Massé."
"And if Loupart should enter the Cité in the meantime?"
"Come straight back to me."
Fandor was moving off when Juve addressed him out loud: "Thank you, kind gentlemen! But as you are so charitable, give me something more for God's sake."
The other drew near the pretended beggar and Juve added:
"If anyone questions you as you pass through, say you are going to Omareille, the decorator's; you'll find me on the stairs."
Some moments later the little crowd had melted away and a policeman, arriving as usual too late, wondered what had been going on.
Fandor carried out Juve's instructions to the letter. Hiding behind a sentry box he kept an eye on the doctor's house, but nothing out of the way happened. Loupart had vanished, although he was probably not far away. When the fifteen minutes were up Fandor left his post and entered No. 27 Rue Victor Massé. As he reached the third floor he heard Juve's voice:
"Is that you, lad?"
"Yes."
"The porter didn't question you?"
"I've seen no one."
"All right, come up here."
Juve was seated at a hall window examining Doctor Chaleck's house through a field glass.
"You've not seen Loupart go in?" he inquired as Fandor joined him.
"Not while I was on watch."
"It's well to know one's Paris and have friends everywhere, isn't it?" continued Juve. "It occurred to me quite suddenly that this might be an excellent place from where to follow citizen Loupart's doings. You would have spoiled everything if you had followed him into the Cité. That's why I devised my little scheme to hold you back."
"You are right," admitted Fandor, who, the next moment, gave a jump as Juve's hand gripped him hard.
"Look, Fandor! The bird is going into the cage!"
The journalist, excited, saw a figure already familiar to him in the act of slipping into the little garden which separated Dr. Chaleck's house from the main thoroughfare.
The detective went on: "There he goes, skirting the house until he reaches the little door hidden in the wall. What's he up to now? Ah! He's fumbling in his pocket. False keys, of course."
They saw Loupart open the door and make his way into the house.
"What comes next?" inquired Fandor.
"We are going to tighten the net which the silly bird has hopped into," rejoined Juve, as he bolted down the stairs, and added as a precautionary measure: "While I question the porter, you slip by me into the main street. I have every reason to believe that M. Chaleck has been absent for two days, and as soon as I get this information, I shall pretend to go away, and then — the rest is my concern."
Juve's program was carried out in all points.
To his questions, the porter replied:
"Why, sir, I can't really say. I saw Doctor Chaleck go off with his bag and I haven't seen him come back. However, if you care to see for yourself —— "
"No, thanks," replied Juve, "I'll return in a few days. But look out, your lamp's flaring!"
As the porter turned to remedy the trouble, Juve, instead of going off to the right, quickly followed the direction Fandor had taken and caught up with the latter just outside Doctor Chaleck's house.
"Now for our plan of campaign," he said. "It's darker now than it will be later when the street lamps are lit and the moon rises. That excellent Josephine sent me a rough plan of the house. You see there are two windows on the ground floor on either side of the hall. Naturally they belong to the dining-room and drawing-room. The window to the right on the first floor is evidently that of the bedroom. On the left, this window with a balcony belongs to the study of our dealer in death! That's where we must plant ourselves. Understand, Fandor?"
The journalist nodded. "I understand."
The two men advanced carefully, holding their breath and halting at every step. To catch the ruffian in the act they must reach the study without giving the alarm.
The first story of Doctor Chaleck's house was only slightly raised above the ground: by the aid of a drain-pipe, Juve and Fandor managed without difficulty to hoist themselves on to the balcony.
"Here's luck," cried Juve. "The study window is wide open!"
After putting on a pair of rubbers and making Fandor remove his boots, the two men entered the room. Juve's first precaution was to test the two halves of the window. Finding that their hinges did not creak, he fastened the latch and drew the curtains.
"We'll risk a light," he whispered, taking out a pocket-lamp, which lit up the room sufficiently to allow him to take his bearings.
The study was elegantly furnished. In the middle was a huge desk piled with papers, reports, and files. To the right of the desk in the corner opposite the window and half hidden by a heavy velvet curtain was the door leading to the landing. A large corner sofa occupied the space of two wall panels. A set of book-shelves covered a whole wall. Here and there cosy armchairs invited meditation.
"I don't see the famous safe," Murmured Fandor.
"That's because your eyes aren't trained," replied the detective. "Look at that corner sofa, topped by that richly carved bracket. Observe the thick appearance of the delicate mahogany panel. You may be quite sure that it hides a solid steel casket which the best tools would have no easy job to cut through. That little moulding you see to the right can be easily pushed aside."
Here Juve, with the precision of an expert, set the woodwork in motion and showed the astonished Fandor a scarcely visible key-hole.
"Now, let's put out the light and hide ourselves behind the curtains. Luckily they are far enough from the window for our presence not to be noticed."
For about an hour the men remained motionless, then, weary of standing, they squatted on the floor. Each had his revolver ready to hand.
Ten had just struck from a distant clock when suddenly a slight sound reached their attentive ears.
The two had whiled away the time of waiting by drilling the curtains with a small penknife. These holes were invisible at a distance, but enabled them to see what was going on in the room.
The noise continued, slow and measured; some one was walking about in the adjacent rooms without any attempt to disguise the sound. Evidently Loupart believed himself quite alone in the house of the absent doctor.
The steps drew nearer, and Fandor, in spite of his courage, felt the rapid beating of his heart. The handle of the door leading from the hall to the study was turned, and some person entered the room.
There was an instant of silence, and then the desk was suddenly lit up. The new-comer had found the switch. But he was not Loupart.
He seemed a man of forty and wore a brown beard, brushed fan-shape; a noticeable baldness heightened his forehead. On his strongly arched nose a double eye-glass was balanced. Suddenly, having looked at the clock which marked half-past eleven, he began to loosen his tie and unbutton his waistcoat and then went out, leaving the study lit as if intending to come back.
"It's Chaleck!" exclaimed Fandor.
"Just so," replied the detective. "And this complicates matters;