In the hidden valley of Stover Creek, a secret war rages between the creatures of night and day. While the butterflies of Anther steal nightmares to fuel their beauty, the moths of Lunafly protect the dreams that keep imagination alive.

As darkness spreads across the valley, a new enemy arises, powered by nightmares. Queen Astra must rally an unlikely band of heroes, including a brilliant inventor, a loyal dog, and a clumsy bat. Together they uncover Poppy’s plan, that threatens not only the moths of Lunafly, but all the dwellers of the valley, both big and small.