On September 11, 1857, 120 immigrants aboard a wagon train bound for California were killed by Mormons in Utah. The event is described through the testimony of Nancy Sephrona, who was 4 years old at the time, and was one of the 17 known survivors. The film chronicles the struggle of the massacre descendants from both sides who are still haunted by the tragedy.
The building of the monuments at the massacre site, as well as a dedication and speech by Gordon B. Hinckley, LDS Church President, can be seen in the documentary. The film also contains footage of forensic analysis of human remains found at the site during construction of the 1999 Monument.