Harry Potter and the Goblet of Fire

Reading through Goblet of Fire, I got a strong sense that with this book, JK Rowling stopped writing novels that were meant to just be novels, and started writing novels that were meant to become movies. The opening World Cup action, as well as the very visual nature of the tri-wizard challenges, would seem to confirm this. Despite this, though, the book still manages to be somewhat intriguing, and the ending of it sets a very definite tone that remains with the series until it reaches its conclusion.