To welcome Josje, Karen and Kristel have each bought her a present. But when K3 is away for a moment, Kristel's present is switched. When Josje opens the present, Kassandra appears. Kassandra wants to take Josje's place. Karen agrees, as long as Kassandra has a voice as beautiful as Josje's. What Karen doesn't know is that Kassandra is the daughter of a witch. With a potion, Kassandra takes over Josje's voice. Will Josje now be replaced by Kassandra? Or will K3 come up with a plan so that Josje ...