These are all good & entertaining, some are Classics & you don't have to work to hard to read them. Can't go wrong with any of them.

Without Remorse by Tom Clancy, his best (Movie is a really bad distortion of a great book)
Dr. Zhivago
Lonesome Dove
The 3 Musketeers to be followed by Twenty Years Later
Last of the Mochicans, Deerslayer, Pathfinder series
Shogun, Tiapan, Whirlwind, King Rat
Lone Survivor
Any of the Mitch Rapp series by Vince Flynn, just pure entertainment, easy reading
Islands in the Stream, A Farewell to Arms, For Whom the Bell Tolls
Any of Michener's books, Centennial & The Drifters are very good

MM