There are 12 books in the series, and there is a spin off series. I read all 12 books. This series was very good. I believe they are supposed to be middle grade, which makes them super easy to read. Each book is an epic adventure full of villains, danger, and excitement. I enjoyed the entire series. Halt and his apprentice, Will are great characters. I really enjoyed both of them. I like how they start out so different, and as the books progress and Will grows older, you can really see Halt’s influence on him. But you can also see Will’s influence on Halt, which I thought was done very well. The series is great, I think perhaps it went on too long. I did read all of the books one right after the next, but because there were so many I did end up getting a bit bored, and wishing it would be over. I never wanted to stop reading them, they were always good, but I think because I read all 12 at once it got a bit stale. I should have mixed it up and read a couple then a different book, then a couple more. The series was so good I didn’t want to stop reading though. Overall I highly recommend the series, especially for tweens.