MacLean is one of my favorites - Caravan to Vaccares rocks, but I was bitterly disappointed by the movie. Where Eagles Dare was much closer. I picked up a nonfiction book by Fleming, written in the 50’s, about diamond smuggling recently. Fascinating stuff!
I want to put in a word for Desmond Bagley, Mary Stewart, and M.M. Kaye. You’d probably have to pick them up at a used bookstore or some such by now.