What Lupin felt most in the whole business was Daubrecq's revelation of the whereabouts of the flat. The police had entered his place in the Rue Chateaubriand. The identity of Lupin and Michel Beaumont had been recognized and certain papers discovered; and Lupin, while pursuing his aim, while, at the same time, managing various enterprises on which he had embarked, while avoiding the searches of the police, which were becoming more zealous and persistent than ever, had to set to work and reorganize his affairs throughout on a fresh basis.

His rage with Daubrecq, therefore, increased in proportion to the worry which the deputy caused him. He had but one longing, to pocket him, as he put it, to have him at his bidding by fair means or foul, to extract his secret from him. He dreamt of tortures fit to unloose the tongue of the most silent of men. The boot, the rack, red-hot pincers, nailed planks: no form of suffering, he thought, was more than the enemy deserved; and the end to be attained justified every means.

"Oh," he said to himself, "oh, for a decent bench of inquisitors and a couple of bold executioners!... What a time we should have!"

Every afternoon the the Growler and the Masher watched the road which Daubrecq took between the Square Lamartine, the Chamber of Deputies and his club. Their instructions were to choose the most deserted street and the most favourable moment and, one evening, to hustle him into a motor-car.

Lupin, on his side, got ready an old building, standing in the middle of a large garden, not far from Paris, which presented all the necessary conditions of safety and isolation and which he called the Monkey's Cage.

Unfortunately, Daubrecq must have suspected something, for every time, so to speak, he changed his route, or took the underground or a tram; and the cage remained unoccupied.

Lupin devised another plan. He sent to Marseilles for one of his associates, an elderly retired grocer called Brindebois, who happened to live in Daubrecq's electoral district and interested himself in politics. Old Brindebois wrote to Daubrecq from Marseilles, announcing his visit. Daubrecq gave this important constituent a hearty welcome, and a dinner was arranged for the following week.

The elector suggested a little restaurant on the left bank of the Seine, where the food, he said, was something wonderful. Daubrecq accepted.

This was what Lupin wanted. The proprietor of the restaurant was one of his friends. The attempt, which was to take place on the following Thursday, was this time bound to succeed.

Meanwhile, on the Monday of the same week, the trial of Gilbert and Vaucheray opened.

The reader will remember - and the case took place too recently for me to recapitulate its details - the really incomprehensible partiality which the presiding judge showed in his cross-examination of Gilbert. The thing was noticed and severely criticised at the time. Lupin recognized Daubrecq's hateful influence.

The attitude observed by the two prisoners differed greatiy. Vaucheray was gloomy, silent, hard-faced. He cynically, in curt, sneering, almost defiant phrases, admitted the crimes of which he had formerly been guilty. But, with an inconsistency which puzzled everybody except Lupin, he denied any participation in the murder of Leonard the valet and violently accused Gilbert. His object, in thus linking his fate with Gilbert's, was to force Lupin to take identical measures for the rescue of both his accomplices.

“What would my position be if I let him slip away with all this evidence against him?” The burly, phlegmatic man was sorely troubled in his mind.

“Consider,” I said, “all the essential gaps in your case. On the morning of the crime he can surely prove an alibi. He had been with his scholars till the last moment, and within a few minutes of McPherson’s appearance he came upon us from behind. Then bear in mind the absolute impossibility that he could single-handed have inflicted this outrage upon a man quite as strong as himself. Finally, there is this question of the instrument with which these injuries were inflicted.”

“What could it be but a scourge or flexible whip of some sort?”

“Have you examined the marks?” I asked.

“I have seen them. So has the doctor.”

“But I have examined them very carefully with a lens. They have peculiarities.”

“What are they, Mr. Holmes?”

I stepped to my bureau and brought out an enlarged photograph. “This is my method in such cases,” I explained.

“You certainly do things thoroughly, Mr. Holmes.”

“I should hardly be what I am if I did not. Now let us consider this weal which extends round the right shoulder. Do you observe nothing remarkable?”

“I can’t say I do.”

“Surely it is evident that it is unequal in its intensity. There is a dot of extravasated blood here, and another there. There are similar indications in this other weal down here. What can that mean?”

“I have no idea. Have you?”

“Perhaps I have. Perhaps I haven’t. I may be able to say more soon. Anything which will define what made that mark will bring us a long way towards the criminal.”

“It is, of course, an absurd idea,” said the policeman, “but if a red-hot net of wire had been laid across the back, then these better marked points would represent where the meshes crossed each other.”

“A most ingenious comparison. Or shall we say a very stiff cat-o’-nine-tails with small hard knots upon it?”

“By Jove, Mr. Holmes, I think you have hit it.”

“Or there may be some very different cause, Mr. Bardle. But your case is far too weak for an arrest. Besides, we have those last words — the ‘Lion’s Mane.’ ”

“I have wondered whether Ian —”

“Yes, I have considered that. If the second word had borne any resemblance to Murdoch — but it did not. He gave it almost in a shriek. I am sure that it was ‘Mane.’ ”

“Have you no alternative, Mr. Holmes?”

“Perhaps I have. But I do not care to discuss it until there is something more solid to discuss.”

“And when will that be?”

“In an hour — possibly less.”

The inspector rubbed his chin and looked at me with dubious eyes.

“I wish I could see what was in your mind, Mr. Holmes. Perhaps it’s those fishing-boats.”