Ian Brady, psychopath, sadist and child murderer, has been in captivity for nearly 50 years, but he is still a powerful and disturbing presence. When acclaimed director Paddy Wivell set out to make a film about Ian Brady's legal bid to be transferred from a psychiatric facility to a prison, he had no idea that he would find himself witnessing one of Brady's notorious power plays. Wivell met the solicitors and psychiatrists who've been closely involved in his cases over the last decades, many of whom would be speaking publicly for the first time. But a startling meeting with Brady's mental health advocate for the last 15 years changed the course of the film…