Robert Jordan has written one of the better fantasy sagas out there. His Wheel of Time series is just plain wonderful. Swashbuckling adventure and a quest to save the world. What more could you ask for?
Unfortunately Mr. Jordan died before finishing his epic. He left behind copious notes and tape recordings, thankfully. Another very fine author, Brandon Sanderson, took up where he left off and finished the story.
There are a total of 14 books (and 3 novellas, two of which I've skipped) in the set and none of the novels are short. You could build a house with these books! It's a huge investment of time, but so well worth it. I have the last three waiting for me and I just can't wait until I finally find out how it all ends.