Peter Stewert is an ordinary outcast until one day, Lily Portman shows up at his school.  Lily can see invisible creatures spread throughout the world attaching to everyone except for Peter.  Peter saves them from a deadly accident.  They both find out that, in a magical city called Carlion, Peter is destined to fight off the evil creatures that Lily sees controlling the human race.  Because Peter always thinks logically, he denies this.  However, denying the truth proves difficult, especially when he starts to unravel Carlion's deepest secrets -- secrets that even most of the citizens don't know about.