In February of 1861, just days before he assumed the presidency, Abraham Lincoln faced a "clear and fully-matured" threat of assassination as he traveled by train from Springfield to Washington for his inauguration. Over a period of thirteen days the legendary detective Allan Pinkerton worked feverishly to detect and thwart the plot, assisted by a captivating young widow named Kate Warne, Americas first female private eye.As Lincolns train rolled...