Obviously, this is the best book in the series! The series in general is dripping with sheer girl power and magic soaked in mythology.
This was the worst one of the series thus far. Tianna is a completely new character, in which she has memory loss for 206 out of 274 pages. So you, the reader, are stumbling around blindly with her as she is introduced to the Daughters and Followers chasing her. The writing was worse in general as well. By the end, Tianna is made an honorary Goddess of the Moon because of the Atrox killing her family and her help with telekinesis.