This is the second book I’ve read recently that was set soon after the Cuban revolution, and Fleming didn’t think it would last (to the contrary, Brett Haliday thought it might be a good idea.) These things strike me.
This book deals with a post-brainwashing, post-trying-to-assassinate-M Bond unbrainwashed and assigned to kill a Caribbean hitter who used a goldern Colt .45 revolver and custom gold-loaded bullets. Bond goes down there, infilitrates, and gets his man.
I can’t remember how the Roger Moore Bond film of the same name worked, but I would guess it differed greatly from the book. It’s a pretty good read, an artifact of the times and of the medium (pseudo-pulp spy fiction, the good stuff before the epic, moral-grey-area stuff came on).