Rosemary Daynton, a day pupil of St. Ann's, Franbridge, is determined, with the assistance of her friends in the Fourth, to help the school retain its high place when faced with serious opposition from Vraimont, a smart boarding school recently opened in the same town.

Of course, the girls, in their enthusiastic efforts to help their school, meet with many scrapes. How they overcame them, and what happened when an attempt to burgle the headmistress's coin collection was made, is told in this quite unusual school adventure for girls.