On a summer evening in 1974, Jim Thomson arrived home from a baseball game to the news that his younger sister, Eileen, had taken her own life. To Jim, his parents, and his brother, Keith, the loss was unexpected and devastating. Only twenty-seven years old, Eileen had been living in California with her high school sweetheart, Vic, a cop, surrounded by a circle of close friends and working at a job she loved. It seemed unfathomable that she would kill herself, but as the family gathered in Pitts...