My absolute favorite book series is the His Dark Materials trilogy. I've read them a LOT, and I still don't get bored of them. They made a movie of the first book, The Golden Compass, but it wasn't great, and they never made movies of the other two books. But recently they made a TV series that has 2 seasons out already, and the third season is in production. So far the TV series is pretty faithful to the books, but the changes they have made don't feel out of place.