I like Jostein Gaarder. His books are usually really good at that childlike sense of wonder, and at getting me thinking, as well as being very easy to read. The Orange Girl is all of that. It's not a masterpiece, like I remember The Solitaire Mystery being, but it's very good nevertheless.
A 15 year old boy, whose father died 11 years before, gets a letter that his father wrote to him just before dying.
This book is funny, it's sad, it's romantic, it's got a great sense of wonder and enthusiasm, and it makes me happier to be alive than I was when I started reading it.
The big question here is if you had the choice at the beginning of time to live or not to live, knowing that if you lived you'd only live for a short time, what would you do?