Dr. Kai Chang had to give up her baby sister during the Cultural Revolution and has since discovered that a genetic defect may be waiting to fatally strike Lily, now a young, rebellious teenager.

"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 twelve 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...