Miss Pentangle brightens the gloom at Cackle's by teaching modern witching workshops, but Mildred is determined to see Miss Cackle reinstated. Sybil finds the workshops too much and Mildred takes a risk to help Miss Cackle.

The girls frantically try to reignite the Founding Stone, and Ethel and Mildred are surprised by their family history. Halloween celebrations mask the magical mayhem as the castle starts to freeze. Ethel decides to make a sacrifice.