Alcatraz is going with his grandfather because the Librarians say they want to sign a treaty but something sounds a little strange. He is concerned because of the events that have lead to Bastille just not being herself, and he is starting to discover that maybe his talent goes beyond just breaking things. There is a librarian who says she doesn't want to be anymore but can she be trusted? And Alcatraz is now trying to convince his reader that he is a superhero, exuding kindness - not the evil, manipulative young man he spent the last two books trying to convince you he was.
These are the kinds of books that you need to pick up when you want to read, but don't really have the mental energy to devote. They are completely appropriate for any reader who understands sarcasm, fun, lighthearted and full of several laugh out loud moments. This was the perfect read when I wanted to escape my thesis, but couldn't really - at least not all the way yet. Read the first two before this one, because Alcatraz will mock you if you didn't. Just a head's up. :)