[ILLUSTRATION OMITTED] Many people credit Allan Pinkerton with developing America's first detective agency, but few realize he also trained the first female detective. However, it wasn't exactly his idea. He wasn't even sure it was a good idea, but Kate Warne insisted that she could go places and do things that no male agent could. When Francois Eugene Vidocq started the Surete in Paris in 1811, he'd employed female undercover operatives, but none had made it a career. Pinkerton broke entirely new ground, but once he hired Kate, she became indispensable. He even entrusted her with one of the riskiest and most responsible jobs ever to land on his desk. Because Kate Warne died young and her records were lost, her legacy is difficult to establish, but her bold spirit makes her one of the most valuable women in forensic history.