The Power - L.J. Smith The final book in The Secret Circle trilogy was not a disappointment. All the characters in the series were finally fleshed out and most of them turned out to be pretty interesting. I liked how Cassie slowly changed from the shy girl she was in the first book to a kick butt witch. She's probably my favorite L. J. Smith heroine. The ending of the series was a little to happy to be realistic but I liked it anyway.