Ten-year-old Princess Millie finds herself far from her European castle, thrust into the whirlwind of horse school madness in the heart of Kentucky! There's just one little twist: her true royal identity is a closely guarded secret! Determined to blend in with her Chestnut Academy classmates, Millie resorts to daring measures-like a bold hair transformation. Can she manage to keep her regal heritage concealed?

Saddle up for an unforgettable adventure as Millie gallops her way into the hearts of new friends, takes on the exhilarating challenge of competing with the magnificent mare, Starlight, and uncovers the profound importance of embracing her authentic self! Get ready for a wild ride brimming with laughter, the bonds of friendship, and the boundless power of true princesshood!