At just forty-one years old, Dr. Autumn Klein, a neurologist specializing in seizure disorders in pregnant women, had already been named chief of women's neurology at Pittsburgh's largest health system. More than just successful in her field, Dr. Klein was beloved--by her patients, colleagues, family, and friends. She collapsed suddenly on April 17, 2013, writhing in agony on her kitchen floor, and died three days later. The police said her husband, Dr. Robert Ferrante, twenty-three years Klein's senior, killed her through cyanide poisoning. Though Ferrante left a clear trail of...