Georges Simenon: Pietr the Latvian

What he sought, what he waited and watched out for was the crack in the wall. In other words, the instant when the human being comes out from behind the opponent . . . 

"Good Lord! Is this the way you search for someone?" she snapped, turning to Maigret. "I'm told you're from the police. My husband may have been killed.... What are you waiting for?"
The heavy gaze that he turned on her was a hundred percent Maigret. Utterly calm. Utterly indifferent. As though he had just heard a fly buzzing. As though he were looking at some completely commonplace object.