Billy and Bonnie are called into a series of alternate dimensions called the Circles of Seven in order to free prisoners that have been bound there by Morgan, the evil sister of King Arthur. She wants to lure the two anthrozills to her so she can destroy them. Professor Hamilton continues to decipher Merlin's diary in order to guide the two chosen children through the circles safely. But when Bonnie becomes seriously injured, Billy must make a hard choice between saving the prisoners or saving his only true love.
I can't express to you how tired I am of plots like this. Circles of Seven is a cheap, mindless quest with all the trimmings-CRT's, near-death experiences, confrontations, showdowns, and the like. There nothing really special about this addition to the Dragons in Our Midst series.
The characters are slowly morphing into perfection with each book. Bonnie and Ashley lost whatever good characteristics they had in The Candlestone. Morgan is a typical, cheesy villain, complete with Literary Trash sayings at the push of a button and maniacal laughing. Also, the discovery of the knights in The Candlestone has created a sea of unnecessary characters without personalities.
Where Bryan Davis did well at thoroughly explaining fantastical elements in The Candlestone, he lacks that in Circles of Seven. There are several tools and procedures regarding alternate dimensions that confuse the reader because of lack of explanation. This is unprofessional, especially since he described things well in The Candlestone.
Other than those things, there is really no point to the book at all. I would say that it is a sidetrack from the original point of the series, but what is the point of the Dragons in Our Midst series? One interesting thing happens at the end of the book that serves to open up a new topic of exploration in the fourth and final installment of the series, Tears of a Dragon. It also serves to make sure everything doesn't turn out right.
I hope Bryan Davis discontinues his track of inconsistency as he continues to author books.