They were learning from the master detective the art of looking like other people, and were at present practicing by looking like the popular conception of Wilton Barnstable.

They were clever men.

But Barton Ward and Watson Bard were, as Cleggett had felt at once, only men of extraordinary talent, while Wilton Barnstable was a genius.
As Cleggett talked he was given a rather startling proof of Wilton Barnstable's gift.

He was astonished to find a change stealing over Wilton Barnstable's features.

Subtly the detective began to look like someone else.