Stella, who's seven, is kind, a good storyteller, and ponders big questions like, what do animals think of people? Marigold, at four, tells imaginative stories (her mother calls them fibs) and likes to wear her favorite Halloween costume year-round.Stella and Marigold do all the regular things - like going to school, playing, getting sick sometimes, and visiting the zoo - but even the most regular things have a secret side.