While the United States battled Vietnamese Communists in the 1960s and 1970s, in neighboring Cambodia dictator Pol Pot and his Khmer Rouge declared war on their own people, enslaving and slaughtering anybody who disagreed with them. Sichan Siv knew he would soon be a target--ending up, perhaps, as one of the millions of anonymous human skeletons buried in his nation's Killing Fields--so he heeded his mother's pleas and ran. Captured and forced...