The Magician’s Nephew — C. S. Lewis
I don’t quite remember what the specific stimulus was for my starting to re-re-re-read Lewis’s classic Narnia books. But this must be at least the tenth time through, going back to when I was eight or nine. (These are often referred to collectively as “The Chronicles of Narnia” but that it exactly what they are not. They are stories, with no pretense to historic verisimilitude or exhaustiveness.)