“I have certainly seen this face somewhere,” said I, taking the portrait over to the window to examine it more thoroughly, “but I can’t, at the moment, remember where.”

“Try,” said Thorndyke. “If you have seen the face before, you should be able to recall the person.”

I looked intently at the photograph, and the more I looked, the more familiar did the face appear. Suddenly the identity of the man flashed into my mind and I exclaimed in astonishment:

“It can’t be that poor creature at Kennington, Mr. Graves?”

“I think it can,” replied Thorndyke, “and I think it is. But could you swear to the identity in a court of law?”