This is a story about an American and a Cambodian witnessing the fall of the old regime, and the unlikely survival of the Cambodian man who stayed and lives through the horrors of the Khmer Rouge's murderous rule, Dith Pran. It should be a book about Dith Pran, since the most eye widening, heart-wrenching, memorable parts of the story are about his survival and escape from the most twisted of dystopias, in slave villages surrounded by killing fields.
However the main character is an American journalist, which probably makes the story more relatable to western readers, and helps present the minimal historical and political anecdotes in the book in a digestible way.
It's a fine story with many emotional moments, as you witness the hardships of the victims of the revolution. It doesn't satisfy for a historical account of events or a political synopsis of the Khmer Rouge revolution and rule, but it's fairly vivid telling of a personal story that any reader can immerse themselves in and gain an incredible sympathy for the people of Cambodia.