“I’ve never been introduced to him, but I’ve passed him on the street a number of times. When your powers of observation have been trained as mine have been it’s no trick at all to take away a mental photograph of a man after seeing him once. If you are specially observant it isn’t hard to notice such details as that regarding the wig. A wig never has the same appearance as natural hair.”

“But how do you know he belongs to the Elks?” asked Joe.

“He wears the lodge emblem as a watch charm.”

“And how do you know his favorite author is Dickens?”