midnight
So entirely informal had been the discussion that Carl still did not suspect that he had been under examination . And the sagacious doctor having gained some information , quite as much , indeed , as he had expected in the first interview , abstained from pushing the matter for the present , and adroitly changed the subject ; but while he continued to converse easily with the young man , he felt assured that he was on the right track . And when , later , he was telling the bishop about it , he declared that he felt sure it was a disturbed mind and uneasy conscience , more than any particular functional disorder , that was robbing the young man of his vitality . But after two days had passed , and he had taken advantage of every opportunity , he concluded that he would take the midnight boat for New York , his mission having been fruitless . Two men sat in a secluded room on a quiet street in London . To look at the building from the street it would have been taken for a modest dwelling house . The room they occupied was spacious , furnished with several desks and tables and lounge and easy chairs .