VI

The detective seated himself in the armchair, and puffed complacently at his cigar. Then suddenly he slapped his thigh in a paroxysm of amusement.

“The fun of it is,” he cried, “that that fool Lestrade, who thinks himself so smart, has gone off upon the wrong track altogether. He is after the secretary Stangerson, who had no more to do with the crime than the babe unborn. I have no doubt that he has caught him by this time.”

The idea tickled Gregson so much that he laughed until he choked.

“And how did you get your clue?”

“Ah, I’ll tell you all about it. Of course, Doctor Watson, this is strictly between ourselves. The first difficulty which we had to contend with was the finding of this American’s antecedents. Some people would have waited until their advertisements were answered, or until parties came forward and volunteered information. That is not Tobias Gregson’s way of going to work. You remember the hat beside the dead man?”

“Yes,” said Holmes; “by John Underwood and Sons, 129, Camberwell Road.”

Gregson looked quite crestfallen.

“I had no idea that you noticed that,” he said. “Have you been there?”

“No.”

“Ha!” cried Gregson, in a relieved voice; “you should never neglect a chance, however small it may seem.”

“To a great mind, nothing is little,” remarked Holmes, sententiously.

“Well, I went to Underwood, and asked him if he had sold a hat of that size and description. He looked over his books, and came on it at once.