five
in the morning
He had followed Kitty from Eightieth Street to the Knickerbocker Hotel . There he had lost her . He had loitered on the sidewalk until midnight , and was then convinced that the girl had slipped by . So he had returned to Eightieth Street ; but as late as five in the morning she had not returned . This agent had followed the banker after his visit to Kitty . He had watched the banker 's house , seen Cutty arrive and depart . Taking a chance shot in the dark , he had followed Cutty to the office building , learned that Cutty was the owner and lived in the loft .