In a boarding school for girls Margarita is called to reception: the duchess widow of Santauro, mother of Margarita, has gone to take her out. Her friend Laura, the daughter of Dr. Reyes, is very sad at the departure of her companion. When Margarita comes in contact with sociable environments, the young girl will be exposed to many temptations in the halls. Like Luis de Castro, a soulless seducer who had already conquered her mother, and now is about to do the same with her daughter.