Best friends Rora and Claudia have never felt more like their lives are spiraling out of control. And when they meet Major and Amir - two boys from one of the secret cities of the spheres, ruled by the magic of the astrological signs - they discover they're not alone. There is a disruption in the harmony between the spheres, and its chaos is spreading. To find the source of the disharmony, Rora and Claudia will embark on a whirlwind journey of secrets, romance, and powerful truths - about themselves, each other, and two long-ago explorers named Dante and Beatrice, who were among the first to chart this course toward the stars.