When Johnis, Silvie, and Darsal return to Middle after their strange adventure in our world, they find that the followers of Elyon have diminished and the Horde has grown in their absence. Nothing is as it was, since five years have passed. The trio splits up, Johnis and Silvie going into the desert, and Darsal going to the Horde. Each of them encounter their own trying circumstances. Johnis is seduced by a strange woman who seems to be able to get inside his head and control him. She wants him to destroy Shataiki for her, so Johnis deems it a worthy endeavour. Silvie is skeptical the entire time and follows only to keep Johnis out of trouble. Darsal is captured by the Horde and is taken prisoner. There she hear Elyon tell her of His mission for he-to love the Horde.
Lunaticis the best Lost Book yet because Dekker has abandoned the search for the seven special Books of History. Their finding a book under every rock was getting really old. It takes the series on a whole new track because it makes the great Johnis an imperfect character. Is this done?
Apparently it is. The positions of the characters change in this installment in the series. Where Johnis and Silvie were the leaders who knew what to do, they are now the followers who don't know what to do. Darsal has also turned into a different character because of her circumstances.
Dekker has also used his own licence to create a new type of creature in Other Earth-one that no one but a select few has heard of. It seems that Ted has no long-term planning for the extensive Circle series; he just writes whatever comes to his mind. This gives him freedom to do whatever he wants to his limitless world. This can be good at times, and it can be unprofessional at times.
The book is directly continued in Elyon, the final Lost Book, so it's hard to tell what Dekker might do. There are several things that could very easily be fixed in the last book.
The only problem with Lunatic is the lack of personalities among the characters. They all act stereotypically according to their circumstances.
All in all, the Lost Books is one of the rare series that has actually improved with each book. I didn't think any of these would make the Elite List, but this one has. That goes to show you that you should never prejudge.