Roger Pitney, the stove works king, never employed a man when he could hire a girl in his office. But when the story opens, old Roger is dead, and young Roger, an efficiency expert, is "raising cain" because the girls use too much time primping. He discharges the head bookkeeper and employs a man, who develops to be a notorious crook. Eunice, Roger's stenographer, while primping on the sly, sees the crook through her looking glass copying the safe's combination, then blotting a telegram he has hastily scribbled. Using her glass, Eunice reads the message, which reveals a plot to rob the safe. She secretly notifies the police and the new head bookkeeper is arrested as he opens the safe. The efficiency expert appreciates the efficiency of his employee's looking glass so much that he returns to his father's plan, and then weds Eunice.
—Moving Picture World synopsis