Charismatic and complex, Sergio Vieira de Mello (Wagner Moura) has spent the majority of his storied career as a top UN diplomat working in the world’s most unstable regions, deftly navigating deals with presidents, revolutionaries, and war criminals for the sake of protecting the lives of ordinary people. But just as he readies himself for a simpler life with the woman he loves (Ana de Armas), Sergio takes one last assignment – in Baghdad, newly plunged into chaos following the US invasion. The assignment is meant to be brief, until a bomb blast causes the walls of the UN headquarters to come literally crashing down upon him, setting into motion a gripping life-or-death struggle.