Out of the 3 you mention I think I liked "confesssions" the most. But they were all good. Wicked is second followed by "son". I think wicked was so busy to really deserves a re-read. The major problem with "son of a witch" is that I don't know how it would be as a stand alone book without reading wicked. I think it was character driven, I wanted to know how the characters turned out which I might not have cared about if I didn't read wicked. Still a good read.