The Battle of the Labyrinth

In this book, Percy Jackson and his friends must navigate through Deadalus's underground labyrinth to stop the Titan Lord Kronos from invading their precious Camp Half-Blood. The growing tension and danger is obvious in this book. Kronos is getting closer and the heroes' actions are getting more desperate but they are also getting stronger. This is an interesting series because the books usually take place over a very action-packed week or so. The next book then usually picks up about a year later so the reader does not witness all the growing up the characters go through. The characters grow nonetheless and it truly becomes obvious in this book that they are no longer children just getting immensely lucky (although Percy has a knack for getting immensely lucky).