Gerry Adams has spent decades as president of Sinn Féin, and for just as long has been dogged by the question of how much he knew about, or took part in, the IRA's campaign of violence. This BBC film tracks him through the peace process that reshaped Northern Ireland, filming him at home in Belfast and on trips abroad as he works the diplomacy that followed the Good Friday Agreement. Contributors include Tony Blair, who negotiated with Adams directly during the talks that ended decades of armed conflict, offering a view of the man from the other side of the table. The film does not resolve the argument over Adams's IRA past, which he has always denied, but it sits him alongside the politicians who had to decide whether to trust him anyway, and lets that tension carry the story.