I gave the address of the exact room in which he was to be found, with cautions regarding the elusive nature of this individual. I said that he had been three times in my custody, and those three times he had slipped through my fingers. I have since thought that Inspector Standish did not credit a word I had spoken.

'What is your proof against this Italian?' asked the Inspector slowly.

'The proof is on the body of the murdered man, but, nevertheless, if you suddenly confront Felini with me without giving him any hint of whom he is going to meet, you shall have the evidence from his own lips before he recovers from his surprise and fright.'

Something of my confidence must have impressed the official, for the order of arrest was made. Now, during the absence of the constable sent to bring in Felini, I explained to the inspector fully the details of my plan. Practically he did not listen to me, for his head was bent over a writing-pad on which I thought he was taking down my remarks, but when I had finished he went on writing as before, so I saw I had flattered myself unnecessarily. More than two hours passed before the constable returned, bringing with him the trembling Italian. I swung round in front of him, and cried, in a menacing voice:—

'Felini! Regard me! You know Valmont too well to trifle with him! What have you to say of the murder in Greenwich Park?'

I give you my word that the Italian collapsed, and would have fallen to the floor in a heap had not the constables upheld him with hands under each arm. His face became of a pasty whiteness, and he began to stammer his confession, when this incredible thing happened, which could not be believed in France. Inspector Standish held up his finger.

'One moment,' he cautioned solemnly, 'remember that whatever you say will be used against you!'

The quick, beady black eyes of the Italian shot from Standish to me, and from me to Standish. In an instant his alert mind grasped the situation. Metaphorically I had been waved aside. I was not there in any official capacity, and he saw in a moment with what an opaque intellect he had to deal. The Italian closed his mouth like a steel trap, and refused to utter a word. Shortly after he was liberated, as there was no evidence against him. When at last complete proof was in the tardy hands of the British authorities, the agile Felini was safe in the Apennine mountains, and today is serving a life sentence in Italy for the assassination of a senator whose name I have forgotten.

Is it any wonder that I threw up my hands in despair at finding myself amongst such a people. But this was in the early days, and now that I have greater experience of the English, many of my first opinions have been modified.

I mention all this to explain why, in a private capacity, I often did what no English official would dare to do. A people who will send a policeman, without even a pistol to protect him, to arrest a desperate criminal in the most dangerous quarter of London, cannot be comprehended by any native of France, Italy, Spain, or Germany. When I began to succeed as a private detective in London, and had accumulated money enough for my project, I determined not to be hampered by this unexplainable softness of the English toward an accused person. I therefore reconstructed my flat, and placed in the centre of it a dark room strong as any Bastille cell. It was twelve feet square, and contained no furniture except a number of shelves, a lavatory in one corner, and a pallet on the floor. It was ventilated by two flues from the centre of the ceiling, in one of which operated an electric fan, which, when the room was occupied, sent the foul air up that flue, and drew down fresh air through the other. The entrance to this cell opened out from my bedroom, and the most minute inspection would have failed to reveal the door, which was of massive steel, and was opened and shut by electric buttons that were partially concealed by the head of my bed. Even if they had been discovered, they would have revealed nothing, because the first turn of the button lit the electric light at the head of my bed; the second turn put it out; and this would happen as often as the button was turned to the right. But turn it three times slowly to the left, and the steel door opened. Its juncture was completely concealed by panelling. I have brought many a scoundrel to reason within the impregnable walls of that small room.