In a few moments the clerk returned to say that M. Dufresne was in, and he was shown into the presence of a small, elderly man, who was evidently just about to leave for lunch. ‘I rather wanted to see M. Boirac himself, monsieur,’ said Lefarge, when the customary greetings had passed. ‘It is on a private matter, but I think I need hardly wait for M. Boirac, as you can probably tell me what I want to know, if you will be so kind. I am, monsieur, a detective officer from the Sûreté’--here he produced his official card--‘and my visit is in connection with some business about which we are in communication with M. Boirac. You will readily understand I am not at liberty to discuss its details, but in connection with it he called recently at the Sûreté and made a statement. There were, unfortunately, two points which he omitted to tell us and which we, not then understanding they were relevant, omitted to ask. The matter is in connection with his recent visit to Belgium, and the two points I wanted to ask him are, first, the hour he left the office here on that Tuesday, and second, the hour at which he telephoned to you from Charenton that he was making the journey. Perhaps you can tell me, or would you prefer I should wait and see M. Boirac himself?’ The chief clerk did not immediately reply, and Lefarge could see he was uncertain what line he should take. The detective therefore continued:-- ‘Pray do not answer me if you feel the slightest hesitation. I can easily wait, if you would rather.’ This had the desired effect and the clerk answered:-- ‘Certainly not, monsieur, if you do not wish to do so yourself. I can answer your questions, or at least one of them. The other I am not so sure of. I received the telephone message from M. Boirac from Charenton at about quarter before three. That I am sure of as I particularly noted the time. As to when M. Boirac left here that morning, I cannot be so definite. He asked me at nine o’clock to draft a rather difficult reply to a letter and to take it in to him when ready. It took me half an hour to compose, as several figures had to be got out to make the matter clear. I took it in at 9.30 and he had then gone.’ ‘That was on the Tuesday, wasn’t it?’ ‘Yes, on the Tuesday.’ ‘And it was on the Friday morning M. Boirac returned?’ ‘That is so, monsieur.’ Lefarge rose. ‘A thousand thanks, monsieur. I am very grateful to you for saving me a long wait.’