A provincial Russian town is shaken by a series of mysterious deaths of teenagers. Dana grieves for her younger sister, who deliberately stepped in front of a train. She is desperate to find out what really happened. Dana explores her sister's online history, and discovers a sinister social-media game that encourages young people to take an escalating series of self-harm challenges. If they don't, they risk losing friends, family or their own lives. In order to hunt down those behind her sister's death, Dana decides to enter this deadly game, opening a doorway into the cruellest of hidden online worlds. A disturbing thriller based on actual cybercrimes that ripped across Eastern Europe. Shot in the Screenlife storytelling format, it is a film about the ways that teens can find themselves manipulated online.
—https://wff.pl/en/film/37-blue-whale