A story about covert postmen? They were organized and stealthy...like a cross between organized crime and martial arts experts. Maybe they were mobster-ninja mailmen? Oh, and of course, they were British.
If this makes little sense, this is sort of the way the book was written. One rambling, coincidental scenario and story after another.
It was interestingly far-fetched, and the style matched what he was trying to say about life. Although it did keep the characters at a distance--probably more commentary about life though.
It was also nice to see a woman at the forefront of a detective story. Not so crazy about the fact that she was also a bit flighty, emotional, and even hysterical at times.
So, imagine Play It As It Lays (it's California, it's drugs, it's the 60s) but with more a sense of humor and then set it in a noir background and you might start to get a sense of this book.
Also, I could not help but think about the ending to Eyes Wide Shut. That might sound strange, but both are about secret societies and leave the main character wondering if anything that happened was actually real.