The Alchemist by Paulo Coelho. It was a while back, so I can't remember exactly, but I do remember my friend not doing it any favours by really praising that book. Perhaps I was expecting too much, but by contrast, I found it to be a rather naïve, consensual, and superficial self-help book trying to masquerade as something more profound with a thin veneer of new-age spirituality.
Hope I don't offend someone who loves it. I don't feel strongly about it now, it was a while back, so maybe I missed something then. If someone disagrees with me I won't die on that hill.