Alexandra is a teacher in a private school and she falls in love with the father of her pupil. They have relationships and his daughter is very attached to Alexandra trying to imitate an adult and beautiful woman. The director likes Alexandra too and that’s why he's trying to ruin her current idyll. Another storyline takes place in a parallel with this one. It is about the investigator Tatyana, she and her husband try to have a baby. They find a surrogate mother, who works as a cleaner in the same private school. When the students have been poisoned by an unknown toxin the characters' lives have been completely changed. All victims are Alexandra’s students. The daughter of her beloved has also suffered. Tatiana is organizing an investigation.