Idea Deity is on the run from his controlling parents. They make him study so much that he creates a fake band called Youforia for his own amusement. Reacher is the leader of the supposed made up band Youforia. Reacher is trying to discover who is posting the personal information of the band online, while Idea is trying to figure out who is posing as his made up band Youforia. The connection between the two is Eurydice/Eunice. Eurydice is Reacher's girlfriend and fellow band mate. Idea encounters Eunice on his way to Maysfield for Youforia's debut concert. As they travel to Maysfield, Idea and Reacher are reading a book called Fireskull's Revenant, which is about Johnny Without and Lord Fireskull, two mortal enemies. They receive a prophecy that unless they join forces they will perish. This plays into the main plot and is foreshadowing what will come with Idea and Reacher. Eurydice/Eunice takes Idea and Reacher to the same diner where she convinces them that they are both real just in two separate realities. They agree to work together, and are taken into the characters of Johnny Without and Lord Fireskull to unite and defeat The Secret King.
I enjoyed the book. It was a bit slow to get going, but after 100 pages or so it picked up. I liked how the book within the book started to parallel the main story. It foreshadowed what was to come, but didn't give the story away. I was not expecting what happened at the end. It was a nice twist to pull together the different plot lines in the book.