Blazing through
The Miernik Dossier by Charles McCarry.
Published first in 1973 and set in about 1959, it's an espionage novel about several male and female covert agents from different countries and cultures who go on a road trip in a massive Cadillac from Switzerland to Austria and south to the Middle East, trying to keep their cover all the while. It's unlike anything I've read.
McCarry's been totally overlooked and is a great writer, in the same league as Le Carré or Graham Greene in the espionage/historical/mystery genres, if not better. This was his first, and there's more, most featuring an American spy named Paul Christopher. Great characters. Good stuff.
One warning -- I couldn't find this one as an e-book, but some of his others are e-books.