First of all: The Hobbit and The Lord of the Rings series, written by J.R.R. Tolkien.
This is probably the most amazing series that I have ever read.
It is so well written and full of adventure! The history of Middle Earth (where the books take place) is realistically complex, yet consistent, and full of little things that you only notice after reading it twice or thrice.
Sylvia's favorite book in this series is the last one, The Return of the King.
My favorite is the first book, The Fellowship of the Ring, in spite of the fact that
many people complain of the first half being so boring and slow. It may be slow, but all the information in it is crucial for understanding and appreciating the other two books! After a while, you grow to even love the "boring" parts.
My other favorite series is The Chronicles of Narnia, written by C.S. Lewis.
You can tell that I love it. :)
This series is comprised of seven books: The Magician's Nephew,
The Lion, the Witch, and the Wardrobe, The Horse and His Boy, Prince Caspian,
The Voyage of the Dawn Treader, The Silver Chair, and The Last Battle.
Personally, I like them all equally.
Right now, I'm reading The Horse and His Boy.
So, this autumn and winter, I encourage you to pull out a new book, or an old favorite, and simply read it. Imagine... a crackling fire warming your toes, a cup of hot chocolate at your elbow, and a good story... ahhhhh.