Insiang (Hilda Koronel), is a young girl who lives in a small crowded camp ground with her mother, Tonia (Mona Lisa).
Her boyfriend Danny (Rex Cortez) treats her little better than a sex object and her mother’s lover Dado (Ruel Vernal), overcome by desire for young Insiang, rapes her in her own home.
She runs to her mother for sympathy but gets rejected instead. Disillusioned and worn out, Insiang decides on revenge.
Director: Lino Brocka
Cast: Hilda Koronel, Mona Lisa, Ruel Vernal, Rez Cortez, Marlon Ramirez, Nina Lorenzo, Mely Mallari, Carpi Asturias, George Atutubo, Eddie Pagayon, Joe Jardy, Danilo Posadas, Estrella Antonio, Jimmy Calaguas, Belen Chikote