When siblings Dariel Meros and Zafira Kestrel uncover an ancient map in Grandma Lumo's attic, they embark on an epic quest to the hidden Radiant Hygiene Heroes' Hall. Facing foam-covered streams, minty mountaintops, and a temple of plush towels, they master the art of handwashing, tooth care, drying rituals, and grooming skills. Along the way, they befriend soap sprites, outwit Plaque Trolls, and learn that sharing a bar of soap can be as heroic as conquering any trial. By the final ceremony, Dariel and Zafira earn the Radiant Star-and discover that proper hygiene builds confidence, health, and community spirit.