The previous article about Leslie Charteris's Saint books goes into detail about what made these books so attractive to me when I first encountered them.
Such articles are often part of the Defence Against the Dark Arts series, but there are some aspects of the Saint books that disqualify them: there is more to them than just exciting adventures and harmless humour, and it isn't all good.
This article mentions a few more of the attractions and covers some of the negative elements.
Judging by the effect that they had on me, the Saint books probably educated many of their readers. Although I didn't appreciate this at the time, I now realise that the large amount of background information that I passively absorbed helped to expand my horizons and increase my geographical and general knowledge. I learned something about the luxury lifestyles of the very rich for example, including the names of some elite hotels and expensive cigars!
Although they didn't meant much to me when I first read the books, I particularly like the references to London streets, venues and other features that some of them contain. Leslie Charteris must have known the city well, and the details that he gives add interest and authenticity to his stories.
One London street reference comes literally very close to home. I was delighted to see the name of the rather obscure little side street where I now live mentioned in one story: the Saint walks down it to get something to eat, and meets his old adversary Chief Inspector Teal! I wonder whether Leslie Charteris actually visited my street in person.
There are many references to London taxi cabs in the Saint stories: