When Mari Gilbert's (Academy Award® nominee Amy Ryan) daughter disappears, police inaction drives her own investigation into the gated Long Island community where Shannan was last seen. Her search brings attention to over a dozen murdered sex workers Mari will not let the world forget. From Academy Award® nominated filmmaker Liz Garbus, LOST GIRLS is inspired by true events detailed in Robert Kolker's ": An Unsolved American Mystery." World premiered at the 2020 Sundance Film Festival.