Anna Katharine Green 
Golden Slipper, and Other Problems for Violet Strange 

Violet Strange is a one of New York’s most popular socialites, but she leads an unusual double life. When not attending high-class soirees, she spends her time as a private investigator, delving into the underbelly of New York to solve a variety of mysteries ranging from high-profile theft to a dubious murder-suicide within the aristocracy-without ever revealing her true identity. First published in 1915, "The Golden Slipper – And Other Problems for Violet Strange" is a riveting tale of mystery and intrigue not to be missed by fans of classic detective fiction. (Amazon)