I tried reading The Spy and The Traitor by Ben Macintyre, absolutely engrossed in it. So far I've read about a third of it in 3 days, a personal best for me.
I think Historical non-fiction is my jam, so I am thinking about The Guns of August by Barbara Tuchman and for my True crime tentacles, I have found In cold blood by Truman Capote.
Any more suggestions???
by KeySea6643