Albina Cherkasova addresses private detective Tatyana Ivanova. Her son's fiancée, medical college student Marianna Novozhilova, was recently killed. She died of slow-acting poisoning in the apartment of the doctor under whose guidance she was practicing. Novozhilova came to him for an IV and suddenly died. The detective goes to college. One of the students suggests that the girl’s death is connected with her orphan past. It is known that before her death, Marianna launched an active search for her missing friend Veronica, a former pupil of the same orphanage...