Zack has discovered a secret at the heart of the Tower...With high school over, Zack and his friends have time to focus on their service to the Tower, learning powerful magic and traveling the world to defend it from monsters.But a meeting with a stranger, known as the Traveller, has revealed that not everything is as it seems.What starts as the simple pursuit for truth leads into a life and death fight against forces powerful, connected and hidden.Zack will be tested to the limits of his magic, his resolve and his morality.When some of those who claim to defend the world are those who hold it under their heel, Zack will have to decide what he's willing to risk to stand up for what is right.