This significant restriction convinced Maya she was on the right track. But she needed to move cautiously, if she was not to arouse immediate suspicion. So she adhered strictly to her role for nearly a month, keeping her eyes open. If it was a rebel operation, it was almost perfectly disguised. Childress performed the duties of the administrative head of a barber college, and nothing more. The students, about fifty of them, went in and out at regular school hours, and she became casually acquainted with a good many of them. The half-dozen instructors, whom she also came to know, were less regular in their movements, but she could detect nothing suspicious about them. "We cut the hair of Mars," was the college's motto, and she learned that it was the larger of only two barber colleges on the planet. Apparently, it actually did supply graduate barbers to all the dome cities. It took in customers for the students to practice on, and, although many of them were strangers, some of them were prominent Mars City citizens whom she knew by sight. There was no question about it: partially, at least, it was a legitimate barber college, whatever other activities it might mask. The only thing noticeably unusual on the surface was that it was extremely selective in its approval of students who applied for courses in barbering. She discerned that through her processing of the applications. If she was going to find out anything definite, she would have to get into the forbidden rear portion of the building. But obviously there were legitimate classrooms there, in addition to the activities she suspected, and if she were caught nosing around the classrooms she would be discharged at once for violation of the rules, without finding out what she sought. She would have to hit it right the first time. Biding her time and watching, she was able to learn, almost intuitively, from the movements of students, customers and instructors, that the classrooms in which barbering was actually taught were all concentrated on the western side of the building. If there were any more sinister activities, they occurred on the opposite side. Having determined this, she planned her course of action. Near the end of her first month at work, she chose her time one day when Childress was downtown, leaving her alone in the business office. The afternoon classes were in full swing. Taking along a filled-out order form as an excuse, Maya walked quickly down the corridor that stretched across the front of the building. Carefully and quietly, she pushed open the door at the extreme end of the corridor--a little surprised, as a matter of fact, to find it unlocked. She was in another corridor, that struck straight back to the rear of the building. She hesitated. There were doors spaced all along both sides of this corridor. Did she dare attempt to open one, on the chance that the room behind it was unoccupied?