Sounds interesting - I’ll look into it. But I doubt that I will find anything in there at supports the assertion that there was any agreement between leaders of the north and south eliminating slavery as a central bone of contention.
Slavery was the “elephant in the room”.
Biography Don H. Doyle, is McCausland Professor of History at the University of South Carolina. He grew up near Berkley, California, graduated from the University of California, Davis, and earned his PhD in history at Northwestern University. He was a Fulbright professor in Rome, Genoa, and Rio de Janeiro and taught at Leeds University in England. He lives in Columbia, South Carolina.
Do read his book.