Talented mathematician Anna Nikolaevna Shvabrina works as a school teacher. By the will of fate, she begins to help Captain Vershinin investigate complex crimes using mathematical methods. The main tools of the investigator are many years of experience and the basics of forensic science, Anna Nikolaevna is an impeccable knowledge of mathematical methods, formulas and models. It would seem that they are completely different, but it is thanks to this union that it will be possible to investigate the most difficult cases.

Oksana is a journalist specializing in high-profile corruption cases. Kirill is an investigator for especially serious crimes, for whom this journalist pretty much ruins his life. At first glance, they are enemies, but in reality they are spouses on the verge of divorce. Because of her investigation, Oksana falls into the epicenter of a large-scale scandal and finally quarrels with her husband. As punishment, she will have to lay low for a couple of months, working as a correspondent for the local newspaper Evening Shroud.

Yevenia lives a fairy tale: she is young and beautiful, she has a wonderful career and a man of her dream. A doorbell ring changes everything. There is a terminally ill boy on her doorstep saying Yevenia is his mother.

Who would think a luxurious New Year jewelry auction would turn into a heart-rending detective story and its participants would have to spend their holidays chasing thieves in the woods and the countryside? - However, this is what the protagonists will have to do. The auction is of extreme importance for the organizers as the business and wellbeing of Anna, the main character, depends on it. But when everything finally ends, Anna has to start fighting for a lot more important things: love, friendship, faithfulness, memory and even her child's life. What will Anna find in the distant forest when she starts thinking she has lost everything?.

Viktor, a successful businessman and former doctor, illegally returns to the hospital to help his mother who is sick with COVID-19. Risking his life and freedom trying to figure out what it is, he, along with the medical team, helps the hospital to better prepare for the impact of the pandemic.

1944. After the hospital or because of problems with vision and speech, several officers are "written off" to a false airfield. The Nazis take this airfield for the real one, and pilot Ivan Polivanov learns about it at the most inopportune moment.

A large construction company is trying to take over the territory of an orphanage in order to build an amusement park there. The director of the orphanage, with the support of his wards, is fighting for its preservation. The head of the construction company Borisov wants to achieve his goal by any means and hires a professional to solve controversial and slippery issues Polunin, as well as a careerist Chizhikov, who hires bandits. However, the bandits only aggravate the situation, creating more and more problems for Borisov. At the same time, Polunina, who tricked into getting a job as a physical education teacher in an orphanage, begins her subversive work.