Y'all may have already seen this, but it's looks interesting. It is fictionalized, but it involves a "secret" that John Bingham apparently took to his grave concerning a conspiracy to kill Lincoln. Does anyone have any information on Bingham's deathbed "confession"?
[From reading the preview pages of the book on amazon, it appears the confession was indeed a real event (at least according to Bingham's descendants) and that, while he never revealed what it was, it involved Mary Surratt telling Bingham something "terrible" on the day that her sentence was published. I can only imagine that it involved a much broader conspiracy, which most certainly seems to have been the case as Mr. Hall detailed in "Come Retribution".]
http://www.politico.com/story/2013/08/bo...95460.html
http://www.amazon.com/The-Lincoln-Decept...0758290675
Heath