1920. Teresa arrives in Seville fleeing the mysterious murder of the Spanish ambassador in Lisbon and searching for Roberta Luna, a student at the city's ladies' academy. Teresa Teresa gets a teacher position in the Academy.
Manuela, the academy's principal places her position as principal at the disposal of a referendum. Louisa a teacher with a problematic son is her opponent. Roberta and Flavia, 2 students have romances with 2 Penalta boys.
Angela, who organizes the Autumn Dance, goes to a studio to get a family portrait and meets attractive Paula. Teresa meets an old acquaintance from Lisbon. Flavia and Tomas live their love. Roberta does not want to go to the Dance.
Luisa gives a class on sex to the students, but it is a failure. The 2nd class is given by Teresa. Manuela's husband wants to have a baby, while she doesn't. Roberta confronts Rafita. She doesn't want to see him again.
An incriminating photo of Roberta at the party of Rafita causes a fight between the pupils. Teresa advises her parents of Roberta's problem, who come and take her away. Louisa decides to resign from the Academia but returns
Candela is very disappointed because of a test but finally persists in her dream. Luisa's son Arcadio drastically changes after starting a relationship with Maria Jesus. Teresa resigns but changes her mind.
Martin believes Manuela is pregnant. Teresa brings Roberta back to school, wanting to press charges against Rafita. Flavia ponders breaking her engagement. Angela follows her heart.
Macarena tells Angela she knows about the affair with her mother. The school prepares for the spring break holiday, and Teresa volunteers to stay behind alone.
The school suffers a loss, and the students rally together. Luisa struggles with the constant pressures from Arcadio to sell the house. Ramón prepares for his date with Teresa.
Manuela takes time away from school, under a false pretense. Luisa wants to bring back an old tradition with the help of the founder Doña Manuela. Flavia struggles in hiding her feelings for Tomás.
A lipstick advertisement has the students excited. Ángela gets worse missing her children. Margarita tries getting close to Tomás not knowing he's still in love with Flavia. Teresa finds a newspaper article with surprising information.
As the students prepare for the summer break, Manuela faces the possibility of closing the school. Flavia and Tomás confess their love for each other. Teresa's investigation is concluded with the truth when she receives a note.
