The Chink in the Armour by Marie Belloc Lowndes

As the young man came into the dining-room he glanced over to where Mrs. Bailey was sitting and then he looked away, and, unfolding his table napkin, paid no more attention to the only other occupant of the room.

Now this was a very trifling fact, and yet it surprised our young Englishwoman; she had become accustomed to the way in which Frenchmen, or perhaps it would be more true to say Parisians, stare at a pretty woman in the streets, in omnibuses, and in shops. As for the dining-room of the Hotel de l'Horloge, it always seemed full of eyes when she and Anna Wolsky were having lunch or dinner there.