In the middle of the night, an old woman with Alzheimer's disease enters someone else's apartment. She claims that this is her apartment and tells everyone about a certain Lyuba. Having found burn marks on her grandmother's body from cigarette butts and ropes with which she was tied, investigators believe that she was raped. However, this hypothesis is not confirmed. Bobrova and Pankratov establish the identity of the grandmother. This is Nina Glebova, who often visited the apartment as a child, where she was found. Nina's son Nikolai, who leads an asocial lifestyle, falls under suspicion. It turns out that he deliberately took the mother out of the nursing home in order to receive her increased pension. On the eve of Nina's discovery in the apartment, Nikolai's house was having a drinking binge. After interviewing the guests of the party, Bobrova and Pankratov go out to Nina's grandson Sasha and his friend Zhora, who works in the nursing home where Nina used to live.

A two-year-old girl, Katya, walking under the supervision of a young nanny Irina, disappears from the playground. The police suspect that a wanted pedophile is involved in the kidnapping of the baby. But soon Pankratov discovers the girl unconscious in the bushes near the site. Doctors show no signs of rape, but Katya will have a serious operation. Irina claims that she did not allow strangers to approach the child. However, another witness to the incident, an experienced nanny Anna Vladimirovna, reports that she saw a suspicious man with a camera not far from the site. Near the site, investigators find a box of photographic film and with its help go to the photographer, who followed another nanny and ordered by one of the parents to check her reliability. The pictures constantly confirm Irina's alibi. After the operation, the doctors diagnosed Katya with a disappointing diagnosis: bilateral brain contusion with retinal detachment caused by concussion infantile syndrome. It becomes clear that the girl was shaken a lot, but this did not happen on the set, but much earlier. Irina and the girl's mother Svetlana Polyanskaya fall under suspicion.