For more than three decades Cambodia has been ruled by one man, Prime Minister Hun Sen, who came to power in the country's first democratic elections after the horror years of the Khmer Rouge. Australia played a key role in the peace deal that ended the bloody civil war, but the once bright hopes for democracy have long since faded. On Monday, in her first story for Four Corners, reporter Sophie McNeill travels to Cambodia to confront the man whose political opponents have been imprisoned and assassinated in mysterious circumstances.