Lily and Violet are twins—physically identical but quite opposite in character. Lily is brash, up-front and in your face. Lily Loudmouth, her dad calls her. Violet is timid and shy. She lives very much in Lily's shadow—a shrinking violet. Finding it difficult to make friends, Violet finds the perfect solution in Katie, her new pen pal. Soon the two are writing at a fast and furious pace and become very attached to each other. That is, until Katie suggests that they meet.