I bought this at an antique store because I loved the map of Paris on the cover. Published in 1963, it started out in an intriguing way and got into some content I was not enjoying. I was just wondering if I should let it go unfinished when there was a twist that made me keep reading until the end. The last third of the book, especially, read like a modern day suspense novel. It was a bit unsavory at times, but maybe most novels like this are. I did enjoy the setting and time period, though.