Director Alex Gibney discusses his new film, No Stone Unturned, with fellow Director Marc Levin. The film reviews the events of the evening of June 18, 1994 when six men were gunned down and five others wounded in a pub in Northern Ireland that was frequented mainly by Catholics. The families of the victims were promised justice, but 20 years later they still don't know who killed their loved ones. The documentary reopens the mysterious unsolved case with its allegations of massive collusion between British security forces and Loyalist killers.