The story starts with Lucero Sandoval, a sixteen-year-old girl who lives with her father, Santiago Sandoval and her sister, Beatriz. Lucero's mother died when she was very little and that void shows through her rebellious behaviour. Her father decides to send her to a strict boarding school for problematic girls. The director of the school, Luis Mancera abuses his authority by making life impossible for the students of the school. Lucero becomes the heroine of the boarding school where she studies.