The movie version of Twilight, the teenage vampire saga based on the book by Stephenie Meyer, came out today and some hard-core fans have already seen the film at midnight showings across the country. But the popular movie—no surprise here—is boosting sales for the book, and the entire series, said Twilight publisher Little, Brown Books for Young Readers.

“I think it will definitely bring a bigger audience,” said Elizabeth Eulberg, publicist for the Twilight books, in a Reuters article. “We just hope the people who haven’t read the books who see the movie will read them.” Sales of the four books in the series have jumped in recent weeks, Reuters reported, with worldwide sales of topping 25 million, in 37 languages.