On the night of February 25, 1969, an inexperienced, 25-year-old lieutenant, Bob Kerrey, led a commando raid on an isolated hamlet called Thanh Phong in Vietnam's Mekong Delta. While witnesses and official records give varying accounts, one thing is certain: around midnight, Kerrey and his men killed nearly two dozen unarmed women and children. What happened that night and why? It's a terrible secret that Kerrey has borne for more than thirty years...