It doesn't HAVE to be in finance, could ofcourse be something else, most important is that he might get some interest for books. I will check out the suggestions, thanks!
Yes, try Conan and John Carter of Mars. I loved them when I was that age. Really helped give me a sense of adventure and inspire me to travel when I was older. Although they probably also gave me a pretty unrealistic idea of how violence works in the real world.