Be Very Quiet is a story of Thana, a young man that witnessed the rape and murder of his prostitute mom when he was a child. After spending his youth at a temple in the suburbs, Thana comes back to the city to start a new life until one night he sees a man that resembles the killer in his memory. Obsessed with hatred and haunted by nightmares, Thana encounters a path to avenge his mother's death.