The crevice

19 Oct 1861 – 14 Apr 1932

William John Burns was an American private investigator and law enforcement official. He was known as "America's Sherlock Holmes" and earned fame for having conducted private investigations into a number of notable incidents, such as clearing Leo Frank of the 1913 murder of Mary Phagan, and for investigating the deadly 1910 Los Angeles Times bombing conducted by members of the International Association of Bridge, Structural, Ornamental and Reinforcing Iron Workers. From August 22, 1921, to May 10, 1924, Burns served as the director of the Bureau of Investigation (BOI), predecessor to the Federal Bureau of Investigation (FBI). [Wikipedia]

1883 – 1924

"Isabel Egenton Ostrander (1883–1924) was a prolific mystery writer of the early twentieth century who used, besides her own name, the pseudonyms Robert Orr Chipperfield, David Fox, and Douglas Grant. Christopher B. Booth is sometimes (falsely) credited as a pseudonym of hers. She was born in New York City to Thomas E Ostrander and Harriet Elizabeth Bradbrook. Her Ostrander pedigree goes back to seventeenth century Kingston, New York. In the 1920s, Ostrander was notable enough that Agatha Christie parodied her in her Tommy and Tuppence anthology, *Partners in Crime* (short story collection)." - Wikipedia