In 2009 Alex Gibney set out to make a documentary about Lance Armstrong's return to the racing circuit. Armstrong had won the Tour De France seven times and had beaten cancer. He was a winner in every respect until finally the allegations that had dogged him for years, that he had used performance enhancing drugs, caught up with him and on Oprah Winfrey's television show he finally admitted to cheating and Gibney's film, originally designed to celebrate Armstrong, became "The Armstrong Lie", as Gibney searched for reasons for his behaviour. Could it be that he simply had to become a winner whatever the cost? Gibney felt that Armstrong owed him since Armstrong had lied to him in 2009 when Gibney set out to celebrate Armstrong's career, so he continued with his film forcing Armstrong to confront his duplicitous past, (though even now Armstrong is holding some things back), and the result is this extraordinary film. "The Armstrong Lie" is the kind of film that pays tribute, not just to its subject, (though, perhaps, tribute isn't quite the right word in this case), but to the genre itself, (it's as exciting as any fictional thriller). Gibney already has an Oscar under his belt; in a just world he would have added another for this brilliant movie.