Because she believes she is standing in the way of her parents' happiness, seven-year-old Sarah runs away from home. But the world is too big for the little girl and treacherous and insidious dangers are lurking everywhere. But luckily Sarah has her snow globe, a gift from her father, and his promise that whenever the moon rises in the sky, round and yellow and fat as a grapefruit, something quite wonderful will happen. Because inside the snow globe live two fairy tale characters.