The Khmer Rouge slaughtered nearly two million people in the late 1970s. Yet the Killing Fields of Cambodia remain unexplained. Until now. Enter Thet Sambath, an unassuming, yet cunning, investigative journalist who spends a decade of his life gaining the trust of the men and women who perpetrated the massacres. From the foot soldiers who slit throats to Pol Pot’s right-hand ma…