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It wasn't until the fourth movie that adapting all seven books was a given
Surprising as it might seem, producer David Heyman reveals that it wasn't until the financial success of the fourth "Potter" film, "Harry Potter and the Goblet of Fire," that Warner Bros. would adapt all seven films. After the dip at the box office for "Prisoner of Azkaban" there was some concern the franchise was petering out. "Goblet" proved that wasn't the case.
[Left, Rupert Grint, Daniel Radcliffe and Emma Watson in "Harry Potter and the Goblet of Fire."]