Twilight is a series of vampire-based fantasy/romance/horror novels by American author Stephenie Meyer. It follows the adventures of Isabella Swan, a teenager who moves to Forks, Washington and finds her life turned upside-down when she falls in love with a vampire named Edward Cullen.

The series is currently one of the most popular books written for young adults, with 50 million copies sold worldwide and over 7.7 million copies sold in the U.S. alone. The series has been translated into over 20 different languages around the world.

Film Adaptation:
A screenplay for Twilight was written by Melissa Rosenberg and has been adapted into a film by Summit Entertainment. The film is being directed by Catherine Hardwicke, with Kristen Stewart and Robert Pattinson in the leading roles of Isabella Swan and Edward Cullen, respectively. It is set to be released on November 21, 2008