During the Royal Ball, Cinderella and her mice friends discover a secret that could shake their world: the real Prince has been turned into a mouse by the evil witch, and the "Prince" from the Royal Ball is in fact an imposter.

Now, Cinderella and her friends are going to begin a whole new adventure as they set off in search of the true future monarch to save him, and find a way to break the curse that hangs over him.