In a world of human-like "funny animals", two mice, Jan and Dan, are struggling musicians who play a kind of music that is no longer popular. When Dan temporarily leaves Jan alone, she says that she would give anything to be a star. The Devil instantly appears to grant her wish. The contract which Jan signs, without having read all of it, states that she will surrender her soul to the Devil on the night of her greatest musical triumph. On the night that the Devil comes to collect her soul, Jan is reunited with Dan. When Dan finds out that the Devil is coming to take Jan away, he promises to save her.