<P> Warne's arguments swayed Pinkerton, who employed Warne as the first female detective . Pinkerton soon had a chance to put Warne to the test . In 1858, Warne was involved in the case of Adams Express Company embezzlements, where she was successfully able to bring herself into the confidence of the wife of the prime suspect, Mr. Maroney . She thereby acquired valuable evidence leading to the husband's conviction . Mr. Maroney was an expressman living in Montgomery, Alabama . The Maroneys stole $50,000 from the Adams Express Company . With Warne's help, $39,515 was returned . Mr. Maroney was convicted and sentenced to ten years in Montgomery, Alabama . In 1860, Allan Pinkerton put Warne in charge of his new Female Detective Bureau . </P> <P> In 1861, Allan Pinkerton was hired by Samuel H. Felton, president of the Philadelphia, Wilmington and Baltimore Railroad, to investigate secessionist activity and threats of damage to the railroad in Maryland . Pinkerton soon was at work, placing agents at various points in Maryland to investigate the possibility . As the investigation proceeded, Pinkerton became aware that the activity in Maryland did not just end with the railroad, but included the president - elect, Abraham Lincoln . Pinkerton received permission to continue his investigation and focus on the possible assassination plot . Warne was one of five agents sent to Baltimore, Maryland, on February 3, 1861, to investigate the hotbed of secessionist activity . </P> <P> During the investigation, evidence unveiled a plot to assassinate Lincoln on his way to take office . Under the aliases Mrs. Cherry and Mrs. M. Barley (M.B.), Warne tracked suspicious movement among the Baltimore secessionists . It was in part through her undercover work in the guise of: </P> <P> (A) rich southern lady visiting Baltimore with a thick southern accent that apparently Mrs. Warne infiltrated secessionist social gatherings, in the Baltimore area, places such as the classy Barnum Hotel (Barnum's City Hotel), posing as a flirting "Southern belle" and was quick to not only verify that there was a plot to assassinate Lincoln, she developed details of how the assassination was going to occur . </P>

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