Harry Potter - the Goblet of Fire
Actually, it's funny how I got started on these books... my daughter came home from school and said she had to pick a book to read for independent reading in school and the assignment was that she had to tell a parent what she read. So she picked Harry Potter and the Scorcerer's Stone.
So she starts telling me what's going on in the book and I'm thinking "how do I know if she's right or not? She could be making this up or just telling me what she remembers from watching the movie." So I started reading the book as well to keep ahead of her and kinda 'quiz' her on what was going on in each chapter she was supposed to have read.
Well, four books later... I'm hooked.
She's still on Chamber of Secrets and I'm almost done with Goblet of Fire.