In 1917, on the day before Valentine's Day, eighteen-year-old Ruth Cruger disappeared. When the police gave up, a mysterious woman in black vowed to find her. Mrs. Sherlock Holmes tells the true story of Grace Humiston, the detective and lawyer who turned her back on New York society life to become one of the nation's greatest crime fighters during an era when women were rarely involved with investigations. After agreeing to take the sensational Cruger...