On September 11, 1857, a wagon train of 120 immigrants bound for California were slaughtered under a white flag by Utah Mormons in one of the worst massacres in American history. Through the actual testimony of a young girl who survived, interviews with descendants, and forensic investigations, this compelling film breaks through decades of coverup to expose a story kept out of the history books. Descendants of the massacre, haunted by the tragedy to this day, struggle to find forgiveness and healing.