"They will proceed to a theatre afterwards, you may be sure," my companion said. "In that case, if you like we could catch a glimpse of them as they come out. What do you say?"

I answered that I had not the least objection.

"One night does not make much difference. To-morrow morning I shall make a point of meeting him face to face."

"Should you require my assistance then, I shall be most pleased to give it to you?" my companion replied.

I thanked him for his offer, and then we left the restaurant together, hailed a cab, and drove to his flat. It consisted of four rooms situated at the top of a lofty block of buildings near the river. From his windows he could look out over Paris, and he was wont to declare that the view he received in exchange was the most beautiful in the world. Fine as it was, I was scarcely so enthusiastic in my praise.

Among other things they were remarkable for the simplicity of their furniture, and also for the fact that in the sitting-room there was nothing to reveal the occupation of their owner. His clever old servant, Susanne, of whom 'twas said she would, did she but choose, make as clever a detective as her master (she had served him for more than forty years), brought us coffee so quickly that it would almost seem as if she had been aware that we should reach the house at that particular moment.

"We have plenty of time to spare," said my host. "In the meantime it will be necessary for us to find out what they are doing. If you will wait I will despatch a messenger, who will procure us the information."

He wrote something on a half-sheet of note-paper, rang the bell, and handed it to Susanne.

"Give that to Leon," he said, "and tell him to be off with it at once."

The woman disappeared, and when she had gone we resumed our conversation. Had he not had the good fortune to be such a great success in his own profession, what an admirable actor the man would have made! His power of facial contortion was extraordinary, and I believe that on demand he could have imitated almost any face that struck his fancy.