It was the books in my Dad's library that first got me to read for pleasure. I remember him suggesting The Lord of the Rings but it would be several years before I read it. 50 years later I can't actually remember what I read first but over the course of my late childhood, the one that sticks out the most is:

The Magus by John Fowles

I was maybe 14 at the time. You just never know because kids are weird.