Mary Grace Quackenbos

Mary Grace Quackenbos Humiston (née Winterton) (1869–1948) was the first female Special Assistant United States Attorney. She was a graduate of the New York University School of Law and was a leader in exposing peonage in the American South. She was also known as "Mrs. Sherlock Holmes", starting with her work solving the cold case of Ruth Cruger, who disappeared in New York in 1917.