I suppose some have to have everything spelled out for them to enjoy something. I think Harry Potter is great but I absolutely loved Narnia especially "The Voyage of Dawn Treader". I remember when I was asked as a child in school who my favorite author was and I said C.S. Lewis I got a strange look from the teacher. Later I discovered Lewis's other wonderful books. An especially good one is a "Grief Observed" amd "The Screwtape Letters" is a good gift for any friend especially a liberal one (though they are likely not to get it).
But I like most everything Lewis wrote - even The Discarded Image, which is relatively heavy going. I haven't found a copy of his volume in the Oxford History of English Literature series yet, but I'm looking.