five o'clock
Before he left he stepped into a little closet which led out of the reception room and changed his office clothes . Glen 's eyes sparkled . His problem was solved . At five o'clock Glen Mason rode down in the elevator to the ground floor and asked the elevator man how he could identify the inter-urban car . But instead of leaving the building he dodged back to the stairway as soon as the elevator had started on its return trip and ran stealthily up the stairs and again entered the dentist 's reception room . It was empty . Glen boldly entered the little closet and dressing himself in the dentist 's office clothes made a bundle of his uniform .