Book recommendations

[L Verge]

I would add:
The Darkest Dawn by Goodrich
His Name Is Still Mudd by Steers
The Lincoln Murder Conspiracies by Hanchett
My Thoughts Be Bloody by Titone
The Web of Conspiracy by Roscoe (be aware that new research disputes some of his claims, but I still love the detail of the book)
The Union vs. Dr. Mudd by Higdon
The Riddle of Dr. Mudd by Carter

You will find disparities in most of them and personal conjecture, but that's what makes the study interesting - trying to figure out which ones come closest to your ideas and which ones totally change your mind.