Episode 15 of the fourth season of (Шифр) was officially released in 2024 , continuing the popular retro-detective series about former intelligence officers. While the third season aired in 2022, the fourth season premiered online in March 2024 and later on Channel One in October 2024. Plot Summary: Episode 15 (2024)
: Season 4 is the concluding chapter of the original project. Episode 15 of the fourth season of (Шифр)
: Anna and Sonya discover Polina had secret ties to the "stilyagi" (Soviet youth subculture) and had recently changed her lifestyle. Episode 15 of the fourth season of (Шифр)