Charismatic, charming and complex, Sergio Vieira de Mello was the UN's go-to guy, a man who could descend into the most dangerous places, charm the worst war criminals, and somehow protect the lives of the ordinary people to whom he'd devoted his life. Based on Pulitzer Prize-winning author Samantha Power's biography Sergio, this film tells the gripping, inspiring story of his most treacherous mission yet-as the UN Special Representative to Iraq in 2003. On August 19th a huge truck bomb exploded directly beneath his office in Baghdad, instantly killing many UN employees, but Sergio himself was alive. As his fiancé+- Carolina searched desperately through the rubble, two American firefighters from the Army Reserves selflessly climbed into the claustrophobic tomb of the collapsed building, in what would become an intense and desperate struggle to survive.