The Dark Knight director Christopher Nolan has doubts over the next Batman movie - because the third film in the franchise may be too difficult to make.Nolan took over shooting the comic book adaptations with 2005's Batman Begins and followed it up with 2008 hit The Dark Knight.But the moviemaker is unsure whether he will put his name to the next sequel - because third movies are notoriously tricky.He tells the Los Angeles Times, "On a more superficial level, I have to ask the question: 'How many good third movies in a franchise can people name?' At the same time, in taking on the second one, we had the challenge of trying to make a great second movie, and there haven't been too many of those either."But Nolan refuses to rule out his involvement completely, adding: "Is there a story that's going to keep me emotionally invested for the couple of years that it will take to make another one? That's the overriding question. It's all about the story really. If the story is there, everything is possible."

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