Rosie (Sarah Rich), a teen in Woodstock, N.Y., is mourning the anniversary of younger sister Amelia’s death. She’s shocked to discover that the mysterious man who sexploited Amelia — bullying her to commit suicide — is back on the web and seeking new victims. After the authorities refuse to get involved, Rosie discovers a hidden dark side and decides to take justice into her own hands. Calling the film “a feminist horror masterpiece, minus the blood and guts you’ll usually find within movies in the same genre,” Film Threat writes: “If you like twist-filled revenge thrillers, this should be the next movie on your watch list.” A SLIFF note: Actor Marc Menchaca (“Ozark”) — who plays the man Rosie identifies as the online troll — was the 2013 winner of the New Filmmaker Forum competition for his co-direction of “This Is Where We Live.”