Viktor Vetrov, a successful businessman, is accused by a mysterious blackmailer of murdering his wife. His life turns into hell: his business collapses, his friends betray him, and the investigative authorities are desperately digging the earth, trying to find at least some evidence and send Vetrov to jail. The only person who took Victor’s side was his former lover, Investigative Committee investigator Inga Alme. But over time, she begins to doubt the man’s innocence when she learns that his first wife, Tatyana, also mysteriously disappeared many years ago. Both of Victor's wives are soon found dead. The handwriting of the crimes exactly matches the handwriting of the “Kuntsevo Ripper”, whom all the security forces in Moscow have been searching in vain for many years.
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.
A wealthy and influential family hires Katya as a nurse for a dying father. Most unexpectedly, the young woman becomes his closest confidant and the only person in his life whom he can trust. Passions run high around Katya as a huge inheritance is at stake. From a modest nurse, whose only task was to care for the sick in the last days of his life, Katya involuntarily turns into an active participant of the family drama with all its hopes, fights and disillusions. It turns out that the seemingly happy and tight-knit family has its skeletons in the closet, and these secrets can come at a price of a human life.
A decades-old photo of oil field workers becomes a chilling omen for their children, whose lives are mysteriously linked by death and danger, as forensic expert Qin Ming races to uncover whether it’s fate, vengeance, or a calculated murder.
Raghu faces the biggest test of his life when he is a prime suspect in a high-profile murder case. Meera, his ex-girlfriend is closing onto him at the same time. Will the truth prevail or will the case get murkier?
Sergeant John Mackenzie is flying to Russia from the United States under the professional exchange program. The American not only becomes the partner of investigator Vasilisa Vikhreva, but also temporarily settles in her apartment. It's hard for John and Vasilisa to work together — the difference in characters and mentalities affects. But the successful results of joint investigations convince the leadership to create a special department around them to combat crimes committed by foreigners and against foreigners in Russia. Unraveling one case after another, the partners find themselves embroiled in an international espionage game around a major scientific discovery.
A bride is poisoned during her wedding reception, forcing the groom and a photographer to investigate the guests as dark secrets and hypocrisies among the bride's friends and family are revealed.
The fourth part of the Soviet TV series based on Arthur Conan Doyle's stories about Sherlock Holmes. The film was shot based on the story "The Sign of Four" and the story "A Scandal in Bohemia".
Anas undergoes a heart transplant and after his recovery, he begins to hear the voice of the donor, who asks him to uncover a mystery that he has tried hard in his life to reach for his keys, so that Anas begins his journey to uncover the mystery of this mystery.
Two police officers, ASP Aditi Sharma the believer and ACP Vikrant Singhal the skeptic, investigate strange unsolved cases, while unnatural forces impede their efforts.