The two boats fastened to the little pier that jutted out from the garden lay rocking in its shadow. Here and there lighted windows showed through the thick mist on the margins of the lake. The Enghien Casino opposite blazed with light, though it was late in the season, the end of September. A few stars appeared through the clouds. A light breeze ruffled the surface of the water.

Arsene Lupin left the summer-house where he was smoking a cigar and, bending forward at the end of the pier:

"Growler?" he asked. "Masher?... Are you there?"

A man rose from each of the boats, and one of them answered:

"Yes, governor."

"Get ready. I hear the car coming with Gilbert and Vaucheray."

He crossed the garden, walked round a house in process of construction, the scaffolding of which loomed overhead, and cautiously opened the door on the Avenue de Ceinture. He was not mistaken: a bright light flashed round the bend and a large, open motor-car drew up, whence sprang two men in great-coats, with the collars turned up, and caps.

It was Gilbert and Vaucheray: Gilbert, a young fellow of twenty or twenty-two, with an attractive cast of features and a supple and sinewy frame; frame Vaucheray, older, shorter, with grizzled hair and a pale, sickly face.

"Well," asked Lupin, "did you see him, the deputy?"

"Yes, governor," said Gilbert, "we saw him take the 7.40 tram for Paris, as we knew he would."

"Then we are free to act?"

"Absolutely. The Villa Marie-Therese is ours to do as we please with."

The chauffeur had kept his seat. Lupin gave him his orders:

"Don't wait here. It might attract attention. Be back at half-past nine exactly, in time to load the car unless the whole business falls through."

Why should it fall through?" observed Gilbert.

The motor drove away; and Lupin, taking the road to the lake with his two companions, replied:

"Why? Because I didn't prepare the plan; and, when I don't do a thing myself, I am only half-confident."

"Nonsense, governor! I've been working with you for three years now... I'm beginning to know the ropes!"

"Yes, my lad, you're beginning," said Lupin, "and that's just why I'm afraid of blunders... Here, get in with me... And you, Vaucheray, take the other boat... That's it... And now push off, boys... and make as little noise as you can."

Growler and Masher, the two oarsmen, made straight for the opposite bank, a little to the left of the casino.

They met a boat containing a couple locked in each other's arms, floating at random, and another in which a number of people were singing at the top of their voices. And that was all.

Lupin shifted closer to his companion and said, under his breath:

"Tell me, Gilbert, did you think of this job, or was it Vaucheray's idea?"

"Upon my word, I couldn't tell you: we've both of us been discussing it for weeks."

"The thing is, I don't trust Vaucheray: he's a low ruflian when one gets to know him... I can't make out why I don't get rid of him... "

"Oh, governor!"

"Yes, yes, I mean what I say: he's a dangerous fellow, to say nothing of the fact that he has some rather serious peccadilloes on his conscience."

“But the false bottom ain’t ready.”

“Well, he must take it as it is and chance it. There’s not a moment to lose.” Again, with the sense of danger which becomes an instinct with the sportsman, he paused and looked hard at the window. Yes, it was surely from the street that the faint sound had come.

“As to Holmes,” he continued, “we can fool him easily enough. You see, the damned fool won’t arrest us if he can get the stone. Well, we’ll promise him the stone. We‘ll put him on the wrong track about it, and before he finds that it is the wrong track it will be in Holland and we out of the country.”

“That sounds good to me!” cried Sam Merton with a grin.

“You go on and tell the Dutchman to get a move on him. I’ll see this sucker and fill him up with a bogus confession. I’ll tell him that the stone is in Liverpool. Confound that whining music; it gets on my nerves! By the time he finds it isn’t in Liverpool it will be in quarters and we on the blue water. Come back here, out of a line with that keyhole. Here is the stone.”

“I wonder you dare carry it.”

“Where could I have it safer? If we could take it out of Whitehall someone else could surely take it out of my lodgings.”

“Let’s have a look at it.”

Count Sylvius cast a somewhat unflattering glance at his associate and disregarded the unwashed hand which was extended towards him.

“What — d’ye think I‘m going to snatch it off you? See here, mister, I’m getting a bit tired of your ways.”

“Well, well, no offence, Sam. We can’t afford to quarrel. Come over to the window if you want to see the beauty properly. Now hold it to the light! Here!”

“Thank you!”

With a single spring Holmes had leaped from the dummy’s chair and had grasped the precious jewel. He held it now in one hand, while his other pointed a revolver at the Count’s head. The two villains staggered back in utter amazement. Before they had recovered Holmes had pressed the electric bell.

“No violence, gentlemen — no violence, I beg of you! Consider the furniture! It must be very clear to you that your position is an impossible one. The police are waiting below.”

The Count’s bewilderment overmastered his rage and fear.

“But how the deuce —?” he gasped.

“Your surprise is very natural. You are not aware that a second door from my bedroom leads behind that curtain. I fancied that you must have heard me when I displaced the figure, but luck was on my side. It gave me a chance of listening to your racy conversation which would have been painfully constrained had you been aware of my presence.”

The Count gave a gesture of resignation.

“We give you best, Holmes. I believe you are the devil himself.”

“Not far from him, at any rate,” Holmes answered with a polite smile.