When Lemmie Ferguson and her parents move away from Edinburgh to the small Scottish Highland town of Balgownie, she finds comfort in her cluttered, glittery attic bedroom, finally away from the bad memories of her Edinburgh School. She misses her wild and arty older sister Rose Rouge, but she can handle lonely times by using the Marshmallow Magic that Rose Rouge has taught her. But even as Lemmie enjoys her new life and new friends, who really seem to like her rosy, fairy-lit view of things, there is a shadow that lurks. When a bully from her past appears in her new school's halls and threatens to rub the sparkle off of everything, Lemmie starts to wonder if Rose Rouge and their special brand of coping are really what she needs.