Warner Bros. sent Kloves a list of novels that the company was considering to adapt as films. The listing included the first Harry Potter novel, which intrigued him despite his usual indifference to these catalogs. He went on to write the screenplays for the first four films in the series. However, he turned down writing the fifth film, stating that "The fourth film, Goblet of Fire, was really hard to do. I wrote on it for two years. But it’s not that simple and I don't know that I'll ever fully understand why I didn't do it." After Michael Goldenberg wrote the screenplay for the fifth film, Kloves then returned to write the sixth, seventh and eighth installments.