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.

100 years ago, the Russian Empire ... Christmas Eve. December plugs, holiday celebrations, balls and modest luxury holidays, titled nobles and ordinary peasants, the royal family and the soldiers of the First World War, progressive poets and the first skaters - everything was different, except ... the holiday. People prepared, lived, believed dreaming and waiting for this miracle - Christmas!

Anatoli Yefremovich Novoseltsev works in a ratings company, whose director is an unattractive and bossy woman. An old friend of his, Yuri Grigorievich Samokhvalov, who gets appointed assistant director, wants to make Novoseltsev the manager but encounters objections from Ludmila Prokopievna Kalugina, the director. Samokhvalov then advises Novoseltsev to lightly hit on the boss. Ironically, Novoseltsev and Kalugina fall in love with each other...