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.