DN turns 18 next month. I am going to give him a sum of money, but I also want to give him a book that's meaningful. DN and I are very close in that I am one of the very few people he talks to. Even so, he doesn't talk to me all that much, and his mum, my sister, is permanently worried that he's so guarded and might be depressed. He doesn't seem to enjoy what other people his age enjoy, he's not into parties, social media or going out with girls and claims to have no friends, although also doesn't make an effort to stay in touch with the ones he has. His best friend is his lovely dog, he loves going for long walks in nature, and he's an overall fantastic young man, just one of them intelligent troubled sensitive souls. So that's him. He loves reading, and I would love to give him a book/s about finding himself, what's important in life, how we sometimes need to be purposeful about what we do, but without any sentimentality or religion.
Recommendations much appreciated. Thanks!