“Quite true, Watson. The telegram still remains the only solid thing with which we have to deal, and we must not permit our attention to wander away from it. It is to gain light upon the purpose of this telegram that we are now upon our way to Cambridge. The path of our investigation is at present obscure, but I shall be very much surprised if before evening we have not cleared it up, or made a considerable advance along it.”

It was already dark when we reached the old university city. Holmes took a cab at the station and ordered the man to drive to the house of Dr. Leslie Armstrong. A few minutes later, we had stopped at a large mansion in the busiest thoroughfare. We were shown in, and after a long wait were at last admitted into the consulting-room, where we found the doctor seated behind his table.