Don and Mimi Galvin seemed to be living the American dream. After World War II, Don's work with the Air Force brought them to Colorado, where their 12 children perfectly spanned the baby boom: the oldest born in 1945, the youngest in 1965. In those years, there was an established script for a family like the Galvins --- aspiration, hard work, upward mobility, domestic harmony --- and they worked hard to play their parts. But behind the scenes was a different story: psychological breakdown, sudden shocking violence, hidden abuse. By the mid-1970s, six of the 10 Galvin boys, one after another, were diagnosed as schizophrenic. How could all this happen to one family? What took place inside the house on Hidden Valley Road was so extraordinary that the Galvins became one of the first families to be studied by the National Institute of Mental Health.

Over the course of three years, five different women vanished without a trace. All but one of their bodies was discovered on Gilgo Beach, Long Island. The police concluded they were all the victims of one murderer, the Long Island serial killer. Working closely with the victim's families, LOST GIRLS brings into focus the stories of these young women, offering a searing portrait of crime and circumstance that goes to the heart of modern America itself.