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The Galvins seemed like the embodiment of the American dream: a war hero father, a devoted homemaker mother, ten sons and two daughters, and a large house in a picturesque valley. Each of the twelve children showed great promise. Donald was an outstanding athlete, John and Brian were gifted musicians, and Richard was a gifted mathematician. However, over time, those around them began to notice that something was wrong in the house on Hidden Valley Street...
The Galvin family kept a secret—but their skeletons in the closet became public knowledge and the greatest scientific mystery of the 20th century, vexing geneticists and psychiatrists for decades. Behind the scenes, a real tragedy unfolded: abuse, sexual violence, drugs, and even murder. Being a Galvin meant either going crazy yourself or watching your loved ones do so.

Robert Kolker's brilliant investigation is the incredible story of one family that gave hope for healing to millions.