3 stars. Pretty good historical fiction about the first female Pinkerton detectives going undercover to save president-elect Abraham Lincoln from assassination. Nicely plotted, good character development and an interesting look at this real life event from another prospective. The middle of the book bogged down a bit in too much detail and too much going at once as well as a couple of places it slipped into modern times and pulled me out of the story. Nothing major and I enjoyed the book. It would work very well as a movie and I understand there is a book two in process. I was given a copy-this is my own opinion.