Sofia Luana longs to fit into her Colorado hometown. Constantly bullied by her classmates, who see her as an outsider, Sofia only has her best friend, Cara Felicity, for support. When Sofia's parents suddenly decide to move to California, her only hope is Cara, who says her family's moving there, too.

On their plane ride halfway across the country, Sofia and Cara see a magical door in the clouds. The girls soon find themselves in a new land filled with a shapeshifting octopus, winged warriors, and the exiled sorceress Muet starting a war to take the throne.

With her best friend, Sofia must learn to embrace her royal Mehk lineage, figure out who can be trusted, and find the courage to make her own decisions to end the war--or else Muet and her Night Army will extinguish Sofia's skylight forever.