A provincial Russian town is ravaged by a wave of inexplicable teen suicides. Rebellious and sharp-witted schoolgirl Dana grieves for her younger sister, a once-happy kid who suddenly withdrew and stepped in front of a train. Desperate to learn what happened, Dana explores her sister’s online history, discovering a sinister social-media game that encourages youths to take an escalating series of self-harm challenges – 50 tasks in 50 days. Beginning with actions designed to alienate them from
