Tom Stone has never been fond of going abroad. Now that he's no longer on the police force, though, his partner Mary has a suggestion for a post-retirement holiday: a river cruise along the Mekong. In theory, the trip is an opportunity to relax and take in the scenery of Vietnam. It's also a chance to meet people who lived through the Vietnam War, on both sides, and learn more about the country's scarred history. But, when one...