I bought this when I was on vacation in Romania, because it was cheap, and because it was so damn thick, meaning it would keep me reading for a while. Well, it did, but I stopped reading after the third novel. Not bad by any means, but rather outdated. Written just after World War I, the gap between this and Ian Fleming, writing after World War II, is striking. These are very much Victorian, 19th century novels, with far too many improbable escapes and shenanigans, and protagonists who speechify and act like it’s the Middle Ages, not 1917. Is the protagonist an early James Bond? Nope. Not at all. Still decent action and worth a look, if you have any interest in the origins of the genre.