'The Twilight Saga' continues this fall with the release of 'New Moon,' while 'Eclipse' will begin filming this month. ET caught up with screenwriter Melissa Rosenberg, who also is the head writer for "Dexter," to talk about what fans can expect from the next two movies.

ET: What can you tell us about 'New Moon' and 'Eclipse'?

Melissa Rosenberg: It becomes bigger in scope. The first film was really a small romance in a way. There was the battle with James (Cam Gigandet) at the end. That was as big as it got. With 'New Moon,' we have the werewolf clan, we have the Vulturi -- and in 'Eclipse,' there is an epic battle, so with every book, with every episode of the movie, it gets grander in scope, which is fun to write. What was great about that, too, is with the small story and the characters ... to be able to grow with it and track it through, it has really been a great pleasure.

ET: What was the set of 'New Moon' like?

Melissa Rosenberg: 'New Moon' was one of the happiest sets I have ever been on. The guy who picked me up, said, "This is a great set. [Director] Chris Weitz is a genius. It is so wonderful." I was, "Okay, dude, you are overselling." But I got on the set and it was just delightful. You can tell when it is uncomfortable and they are not connecting. Chris Weitz is just a Zen master. I went to him and I was, "You are so cool and calm. And everyone is so cool and calm." He said, "You have no idea what it is going to cost me." My husband is a director and I know what it costs him. You have to tamp down every ounce of panic and frustration in order to project this calmness. I hope Chris got a good vacation between production and post.

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