“What you see in the film is the tip of the iceberg” says producer Gabe Hoffman on An Open Secret, the documentary from Oscar-nominated director Amy Berg about child sex abuse in HollywoodA revealing new documentary about the sexual abuse of children within Hollywood is hoping to lift the lid off an alleged network that implicates major industry figures.An Open Secret, which was shown this week in an out-of-festival screening in Cannes, is a damning new film from Oscar-nominated director Amy Berg, who previously explored paedophilia within the Catholic church in Deliver Us From Evil.