“On the contrary. Number one were the fingerprints of Monsieur Lawrence. Number two were those of Mademoiselle Cynthia. They are not important. I merely obtained them for comparison. Number three is a little more complicated.”

“Yes?”

“It is, as you see, highly magnified. You may have noticed a sort of blur extending all across the picture. I will not describe to you the special apparatus, dusting powder, etc. , which I used. It is a well-known process to the police, and by means of it you can obtain a photograph of the fingerprints of any object in a very short space of time. Well, my friend, you have seen the fingermarks⁠—it remains to tell you the particular object on which they had been left.”

“Go on⁠—I am really excited.”