The Farmer family is in big debts; they might lose their house soon. The seven year old Farmer twins, Kelly and Lynn, decide not to let this happen. They discover that somebody really mean and shrewd is responsible for all the problems of their family: it's their aunt Agatha! Thanks to the moon stone that she found years ago, aunt Agatha is now a witch. She has supernatural abilities but unfortunately uses them to do bad things. She is malicious and loves injuring others, even her own family. The girls must take the magic stone from Agatha.
Double, Double, Toil and Trouble is a 1993 Halloween children's TV movie. It stars Mary-Kate and Ashley Olsen as two adventurous little girls who discover that their Great Aunt Sophia has been trapped and cursed by her evil twin sister Agatha. On the 7th year of her imprisonment, Sophia will be doomed to the netherworld unless the spell is broken by the magical spell of twins. The film's title is part of the famous line spoken by the three witches in Shakespeare's Macbeth: "Double, double toil and trouble; Fire burn and cauldron bubble."