"Murka" is a crime detective series about the legendary undercover agent Marusa Klimova, who worked in a dangerous gang. The story takes place in 1922. A special unit of the State Political Administration of the NKVD, codenamed "Apostles," is sent from the capital to Odessa. The operatives' goal is to infiltrate the criminal group that is terrorizing the entire country and "eliminate" its leader, Brilliant. Murka plays a crucial role in gaining the trust of the authority and seducing him.