On the eve of the longawaited Khmer Rouge trial an American survivor of the genocide returns to Cambodia hoping to unlock the mystery of her fathers disappearance in 1975 Thida Buth Mams quest intersects with many silent voices widows survivors from remote villages monks and even former perpetrators Her search for the truth stirs up the fractured pieces of one familys nightmare unearths an unimaginable heartbreak and ultimately shines light on a peoples broken silence