The only common theme in this book is Star Wars. The subjects that are brought in are of a vast variety. There are comparisons made to Star Wars. Cass susses out how Star Wars is commenting on various things in our world (this galaxy). There is a fun amount of Star Wars trivia and history. There are also some of Cass' favorite subjects, such as constitutional law with only trepid tie-ins to Star Wars. It's a playful romp. I enjoyed it.