Puss's party finds the third witch's room empty, her window open, and one by one seem to fall prey to her enchanting flute. Still the pier sister is overcome, but her piece of the jewel doesn't complete the Crown of Souls. There must be a fourth and indeed the castle has a cloaked last tower, only it's uninhabited. The duchess plays a key part in discovering its confusing secret and dealing with the curse.
—KGF Vissers