There is a Tower that, if climbed to the top, will grant any wish. At its peak is everything in this world, and all of it can be yours—you can become a God. This is the story of Rachel, the girl who climbed the Tower so she could see the stars, and Bam, the boy who needed nothing but her. When Rachel enters the Tower, Bam follows her in desperation, only to discover he is an "Irregular"—someone who was not chosen by the Tower but opened the gates himself. As he ascends each floor, he must face deadly tests administered by the Tower's Guardians, navigate the complex politics of the Great Families, and uncover the truth of his own forgotten origin while constantly being pursued by those who fear his potential to change the Tower's laws.