Spoiler Alert! The fourth book in the series, published in 2008, finds Bella and Edward finally marrying, doing the nasty and getting pregnant, which turns out to be actually nasty.

When her childbirth nearly kills her, Edward turns Bella into a vampire and, after a quick tussle with the Volturi (who are convinced that half-human/half-vampire crossbreeds are inherently dangerous), the family is allowed to live their lives in peace. Well, for now…

And it's a big tome - one that author Stephenie Meyer thinks might have to be more than one film, a la Harry Potter And The Deathly Hallows.

“The book is actually broken up into book one, book two and book three, and the end of book two is kind of the exact middle of the story,” Meyer says. “It really feels like the clearest place to stop the action, but I’m not a movie person, I don’t know. I just think it’s too long for one movie.”