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 Growler and the Masher 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.

“I need not appear in the matter at all,” said Holmes to the evident relief of our melancholy acquaintance. “If I can clear it up I don’t ask to have my name mentioned.”

“Well, it’s very handsome of you, I am sure. And your friend, Dr. Watson, can be trusted, I know. Now, Mr. Holmes, as we walk down to the place there is one question I should like to ask you. I’d breathe it to no soul but you.” He looked round as though he hardly dare utter the words. “Don’t you think there might be a case against Mr. Neil Gibson himself?”

“I have been considering that.”

“You’ve not seen Miss Dunbar. She is a wonderful fine woman in every way. He may well have wished his wife out of the road. And these Americans are readier with pistols than our folk are. It was his pistol, you know.”

“Was that clearly made out?”

“Yes, sir. It was one of a pair that he had.”

“One of a pair? Where is the other?”

“Well, the gentleman has a lot of firearms of one sort and another. We never quite matched that particular pistol — but the box was made for two.”

“If it was one of a pair you should surely be able to match it.”

“Well, we have them all laid out at the house if you would care to look them over.”

“Later, perhaps. I think we will walk down together and have a look at the scene of the tragedy.”

This conversation had taken place in the little front room of Sergeant Coventry’s humble cottage which served as the local police-station. A walk of half a mile or so across a wind-swept heath, all gold and bronze with the fading ferns, brought us to a side-gate opening into the grounds of the Thor Place estate. A path led us through the pheasant preserves, and then from a clearing we saw the widespread, half-timbered house, half Tudor and half Georgian, upon the crest of the hill. Beside us there was a long, reedy pool, constricted in the centre where the main carriage drive passed over a stone bridge, but swelling into small lakes on either side. Our guide paused at the mouth of this bridge, and he pointed to the ground.

“That was where Mrs. Gibson’s body lay. I marked it by that stone.”

“I understand that you were there before it was moved?”

“Yes, they sent for me at once.”

“Who did?”

“Mr. Gibson himself. The moment the alarm was given and he had rushed down with others from the house, he insisted that nothing should be moved until the police should arrive.”

“That was sensible. I gathered from the newspaper report that the shot was fired from close quarters.”

“Yes, sir, very close.”

“Near the right temple?”

“Just behind it, sir.”

“How did the body lie?”

“On the back, sir. No trace of a struggle. No marks. No weapon. The short note from Miss Dunbar was clutched in her left hand.”