Olivia Petunia is a very smart little girl. That's a good thing, because while visiting a farm something very strange has happened. She discovers that her friend, Molly, the cow does not moo anymore. None of the cows do. Molly has an altogether different voice that does not belong to her. This is not right. In the process of finding where Molly's real voice is, she discovers that none of the farm animals, have their own voices either! None!
She has exactly one day to solve the problem, and she thinks she know just what to do.