Skellig by David Arnold
This book stays with you. It's beautifully written. The prose is direct and yet poetic.
It's about big and small things all at once, life, death, heaven, hell, education, relationships, family, thinking, magic, spirituality, but better than the achievement of squeezing thoughts about these epic things into a slim book, is the story, which is utterly compelling.
I can see why it's so well loved. I would highly recommend.