The Twilight Saga : Official Illustrated Guide was released before May 2011 .
The Twilight Saga : Official Illustrated Guide ( previously named The Twilight Saga : Official Guide ) , which is a definitive encyclopedic reference to the Twilight Saga , provides readers and fans with exclusive new material and will be released on April 12 , 2011.Since the release of the first novel , Twilight , in 2005 , the books have gained immense popularity and commercial success around the world .
Twilight -LRB-novel series-RRB-