Beatrice likes the dark. She likes black clothes, graveyard picnics, and a sky full of stars. Her sister, Roo, likes the light. She likes bright clothes, picking strawberries, and hot, sunny days. Beatrice and Roo are nothing alike and don't understand each other. Can Beatrice help Roo love the dark as much as she does? Can Roo help Beatrice love the light? Or are they simply too different to get along?