A young man from the noble Bezsonov family — Nikolai — by chance and at the behest of his heart becomes an ordinary official of the detective police. His colleagues receive him coldly, and only an experienced official, Pyotr Romanovich Shchukin, sees in the young man the future star of the investigation. Together they are trying to uncover a chain of mysterious and dangerous crimes committed either in the city slums or in the boudoir of a socialite.

Moscow, 1956. Four women who are tied by the military past: work in the special department of the GRU, 11 years later converge again to conduct investigations and help the investigating authorities in especially complicated cases. With phenomenal analytical skills, Irina, Anna, Sophia and Katerina risk themselves, as well as the well-being of their own families, in order to get on the trail of criminals who threaten the lives of ordinary people and the whole country. Cipher is a Russian television detective based on the British mini-series The Bletchley Circle. The working title of the series is "The Ciphers". The series is produced by Sony Pictures Television, Lean-M and the Pobeda Production Association. The premiere of the television series took place on March 11, 2019 on Channel One.