NEW YORK There is still plenty of life in Stephenie Meyer's Twilight Saga.Meyer is planning at least two more books in her mega-selling vampire series, she said during a recent promotional event. Meanwhile, the author's long-awaited Midnight Sun sold more than 1 million copies in its first week, Little, Brown Books for Young Readers announced Thursday. Her novels have sold more than 100 million copies worldwide, and were adapted into a blockbuster film franchise starring Kristen Stewart and Robert Pattinson. Meyer once vowed never to write another Twilight book, but on Monday she revealed during an online event held by the chain store Books-A-Million that she is far from done with Edward and Bella. There are two more books I think in the world that I want to write, she said.