This is the conclusion that was reached by Mr.Armitage, who, at times, was singularly happy in his speculations as to the mental processes of other people.

Sometimes, however, he made mistakes, as will appear.
The gentleman for whom John Armitage had been waiting arrived alone, and was received as a distinguished guest by the landlord.
Monsieur Chauvenet inquired for his friends the Claibornes, and was clearly annoyed to find that they had gone; and no sooner had this intelligence been conveyed to him than he, too, studied time-tables and consulted steamer advertisements.

Mr.John Armitage in various discreet ways was observant of Monsieur Chauvenet's activities, and bookings at steamship offices interested him so greatly that he reserved passage on two additional steamers and ordered the straps buckled about his trunks, for it had occurred to him that he might find it necessary to leave Geneva in a hurry.
It was not likely that Monsieur Chauvenet, being now under his eyes, would escape him; and John Armitage, making a leisurely dinner, learned from his waiter that Monsieur Chauvenet, being worn from his travels, was dining alone in his rooms.
At about eight o'clock, as Armitage turned the pages of _Figaro_ in the smoking-room, Chauvenet appeared at the door, scrutinized the group within, and passed on.

Armitage had carried his coat, hat and stick into the smoking-room, to be ready for possible emergencies; and when Chauvenet stepped out into the street he followed.
It was unusually cold for the season, and a fine drizzle filled the air.
Chauvenet struck off at once away from the lake, turned into the Boulevard Helvetique, thence into the Boulevard Froissart with its colony of _pensions_.

He walked rapidly until he reached a house that was distinguished from its immediate neighbors only by its unlighted upper windows.