From what I can tell, the movie covered the first six books in the series, from the abduction of Soren to the battle at St. Aegolious and the defeat of his brother Kludd.
I don't know, maybe it's the combination of all 6 books that I didn't like. Too much in one 90 minute movie. Most adaptation end with covering the first four of a series and I'm usually OK with that. I feel like in that instance each book gets a fair share of time on the big screen. But when you try to cover six, things get rushed and overlooked. Maybe that was my problem.