Eragon book 3

With the third book in "The Inheritance Cycle" now in publication, "Brisingr", The question is, was Eragon a big enough hit for them to be currently working on the movie "Eldest"?

Inheritance 3-Book Hardcover Boxed Set (Eragon, Eldest, Brisingr)

The current rumor is that there is no plan for a sequel to the first movie due to lack of interest by the comments from readers and fans of the book series.